This is the best video I’ve seen on the vac system and how to properly diagnose it from under the hood to the cab ., what a money saver, experience pays , thank you so much for sharing this, well done sir 😊🙏👍💯
I have this problem with my Expedition. Today it was exceptionally hot and as I went to l pass someone uphill I also list AC. When I got off freeway cold air started pumping again. I'm wondering if the heat came on at the same time.
keep this in mind. Heat is generated by combustion in the engine and is ALWAYS there. Heat is regulated by mixing hot air with cold air and controlled by "air blend doors. Cold is generated from the air conditioning compressor and is ONLY there when the compressor is running. That running is controlled by being turned on and off. It is regulated by couply different methods, air blend doors as well as variable valves internally in some newer designs os compressors.
@Sendthemeteormeow To replace the old line, cut it either from the engine side of the firewall or the cabin side of the firewall. Then attach the new line to the old line and wrap it tight with electrical tape and slowly pull the old line with the new line attached to it through the firewall until you have enough line to make a proper reconnection. You may have to have someone assist by feeding and guiding the new line as it is being pulled through in order to avoid hang ups during the transition pull. Hope this helps.
Somebody is not paying this man enough money he is an awesome instructor very talented the way he explains the whole procedure where almost anyone can understand very impressive
Thank you, I've been working on cars for years but I never really understood vacuum lines. after fixing the HVAC door on an Expedition because of your video, I feel more confident about the subject
Old timers would just blow smoke into the line with a cigar/cigarette but your fancy smoke machine is cancer free and prevents vehicle owner complaints of cig smell. 😆
Have to say your videos are some of the best I've seen on RUclips. Your presentation is outstanding. You have saved me a ton of money . I have to say if not a teacher you missed your calling. Thanks again.
You’re a Genius sir ! You’ve explained my situation perfectly. Now I know what my mechanic missed in his diagnosis. Wish you were my service guy. Thank you so much for your help and your knowledge.
This is one of the best videos I've ever seen on this subject!! Very informative! Thank you SO MUCH for sharing your knowledge and experience with us!!
Sir, you are the very best instructer I've seen on this king of problem. Thank you so much, I might can fix my problem now, you may have saved me a lot of money. What you said made a lot of Sense to me, God Bless You, (Mac)
All this so you can operate the AirConditioning system with a turn nob dial? i dont entirely understand how this works But, i rather manually adjust the AC door with a lever than hav all this junk fail on me.
I have a 1968 f-250. Have had it for a long time. The newer the car the more technology's in it. My vent controls are run by mechanical linkage. Not by vacuum.
I did learn apparently when there is no vacuum on these models the blend door defaults to defroster setting (so it seems that the default for vacuum based blend doors is 0 vacuum for defrost vent routing) ...All the other blend door positions for front , by feet ,...etc are a certain percentage of vacuum
Thanks, you clearly know your stuff!!! Fortunately I watched the second half of your video which addressed my issue with a 2003 Expedition. Before anyone loses heart because they don't have a vacuum gauge or smoke machine, take a look at the check valve and the connections to the feed lines, all 3 of mine were perished and had holes. Fortunately I had some spare line, cut 3 pieces and it is back to good health. Major points from the wife as it is her car. I got lucky, but apparently that is the most likely area to go wrong. Good Luck.
I become addicted to your video, every day i look for any new vidoes from you. One can understand why knowledge and experience is important from your videos. you are a role model to any one about how to diagnose and find probems, you make most difficult problem in to very simple one. Awesome, Great, Great.. i dont have words to appreciate you. You rock.
The same exact line broke completely off on my 2002 f 150, I found that out yesterday while I was putting the engine together hopefully for the first and last time. Great video.
Thanks for explaining the vacuum diagram, you certainly are a master in teaching, you saved me from doing unnecessary work. It turned out to be the hose to the vacuum reservoir. Thanks 100%
Thank you for this video, and your other 3 part video on the heater blend door. Fortunately, this job was much easier than the heater blend door was. For other readers, if you have hot/cold problems it is the heater blend door. If you have A/C vents vs. Floor vents vs. Defroster vent problems, then this video applies. The heater blend door is electrically controlled by a servo motor. The A/C vent vs. Floor vents vs. Defroster vents are controlled by a set of vacuum motor servos (driven by engine vacuum). Usually, as shown here, the problem on the vacuum controlled motors is most typically the vacuum feed lines or vacuum resevoir or the vacuum check valve. (Occasionally the problem is the vacuum servo motor, but that is less frequent.) In my case, I bought a $15 vacuum gauge (Harbor Freight Tools), and was fortunate to have a "really" easy to find leak, that I could in fact hear with my ear. Listen for a hissing sound. If your leak is much smaller, or much larger, then you may not get a hissing sound, and then you need a smoke machine. You can make a smoke machine, there are RUclips video's on how to make a make-shift smoke machine. One version of it uses a small (low power tire filler type air compressor). You can also buy one of those air compressors at Harbor Freight tools for cheap, but the other parts of the make-shift smoke machine you have to make, and it takes a while. I have one I made from a metal "jar" some Harbor Freight Tool air compressor line fittings, a bit of wire mesh I had sitting around, and some charcoal brickets and some cardboard (cardboard makes good smoke), brickets stay hot under low air compression.
Couldn’t have done without you. Took me directly to the root cause. Deteriorated hose at the check valve. Replaced the hose and back in business. Thank you!
I love it when videos explain how the system works instead of just showing what you replaced to fix it. My 2003 f150 was not switching off of defrost ever and I found that the hose on the intake side of the check valve had cracked. Replaced it and boom fixed. Thanks again!
Thank you so much I just spent 3 hrs under the dash getting to my ac door actuator only to find out mine works just fine, the 2nd part of this awesome video was my exact issue! You are a fkn legend! God bless you.
I'm h a ving this problem with the AC only coming out of the defroster. I had this problem years ago on a 82 F150. All I had to do was put 2 hoses back on 2 nozzles that was at the back of my engine compartment. Fixed the problem right away. But now, I have no idea what to do & I'm not able to figure it out! But I did suspect a vacuum leak right away! Very sad that I don’t have my mechanic/husband here to help!
Simply amazing explanation. You took a lot of the mystery out of vacuum lines and check valves. Smoke machine really cool. Excellent troubleshooting and repair. Just subbed.
Excellent video! I had the same exact problem on a Ford Van about a year ago. It turned out to be the same exact vacuum hose! Maybe a pattern failure? Thanks for posting this and all your videos. Good job, carry on!
What if you have no air flowing from the front vents at all? I don't notice any airflow on any fan setting, AC, heat, or defrost. Has it still defaulted to defrost? I have replaced the 3 AC fuses under the steering wheel, the blend door actuator relay, the blend door actuator, the blower motor, and the resistor. Still no air flow. 2001 excursion 7.3 2wd. Rear ac blows cold. No air flow at all to the front. I'm going to try this vacuum diagnosis and see what happens. Best video I've ever seen, great teacher.
Just curious shouldn't you have pinched off the engine vacuum and the line running to the reservoir to narrow it down to the line it ended up being? Your gauge shouldn't have dropped because you still had engine vacuum when you blocked the reservoir. Regardless very helpful video thanks for taking the time to make it.
I have a different issue: I have air coming out of the defrost, middle, and floor vents at the same time. When I raise the temperature, the passenger side gets hot but the driver side remains cold. Any suggestions? I have a 99 Buick Regal.
Great info! Would it still be the same issue on a 2015 Nissan Murano? When I first start my SUV, even if the vents are on head, they do not blow any air. The system will SOUND like it is blowing, and as you turn up the flow, it sounds louder, so it is working. However, air doesn't come out. The only way I can get the air to start coming out of the head vents is to turn the vent to front defrost, listen for a little clicking sound indicating the air is then blowing into the windshield, then I can turn it back to head vent, and it blows from those vent. Is that an actuator issue?
Hi had smoke test done couldn't find the leak paid $50.00 buck for nothing, I have a 1993 Pontiac Bonneville se plus I was trying to tell my repair it control panel doesn't make the little blow noise when you are changing the mode you have vacuum leak right?
My problem is that it will go to floor and vent but not defrost. When I turn the mode dial, and place my hand on top of the vacuum motor, you can feel the plunger moving up or down when you turn it to floor and vent, but when you turn to defrost, the plunger doesn't move. I tried a new vacuum motor, but it did the same thing. I tried a new HVAC control panel, but that didn't help either. Vehicle is 2001 F150. Any suggestions would be appreciated. Thanks!
how do you re vacuum the canister? I replace that small hose that goes in the fire wall and now it will switch from defrost to floor but not to vents if it goes to the floor it must have vacuum right? Where does that line connect on the control panel?
Can someone help me please? I have a 2000 Grand Marquis and it blows out only through the vents and not a lot of air. I had the ECC rebuilt and now I do get a bit of air through the proper vents called for at times but only a trickle like if I put on defrost then barely comes out and most through the vents. I think I am not getting enough vacuum. All vacuum motors seem good when I tested them Please help.
Ok boys, i had the same issue, mine wasn't as easy to find . This is if the issue happens under a load. So, to save you A LOT of money, if it's not under the hood, chances are they same line going into the firewall, that's behind the glove box is damaged. Remove the glove box, and right next to the fender you'll see that the line is rubbed.
I have a 2003 f150 4.6... my problem is at idle whenever I turn on the a/c or heater the engine revs, I have checked for leaks with a smoke machine and found no leaks, it only rev with a/c or heater it revs more when I have the setting at panel/floor not so much when the setting is at floor
I was having issues with my 98 Cherokee and it turned out that the vacuum line was gone from where the hose gets smaller after the T down to a few inches before the firewall. I have some hoses and I wanna see if it’ll help fix the lack of power too since it’s complete open with a 1/8” hole.
@realfixesrealfast - Sir why does the manufacturer connect the a/c vent doors to the vacuum? Why does the vacuum something to do with the air door control system? I thought everything is manually controlled at the knob on the dashboard?, Thank you Sir.
When this guy say's there is only 3 pounds of vacuum, he's incorrect, vacuum is measured in inches of Mercury, what he should have said was there is only 3 inches of vacuum
Great video! Opened the hood of my 97 F-150 and had an idea what to look for. The line from the reserve tank was broken and when I tried to disconnect lines from the check valve, it fell apart. All 3 ports just snapped off. Got a new check valve at the auto parts store and connected all the hoses and now I can step on the gas and the AC stays on the vents. Thank you so much.
Ok but there is a red line and black one on my vc can. My problem I have 2 broke lines in wire loom I h a ve a white and black coming from the cab also the blend door line is broken where does the can lines go and the white and black please help.
Really enjoyed watching your video I dont know any mechanics in europe to have a smoke machine , ive heard of them. Now i want one hope they are not too expensive. Great Video Top mechanic !!!
2001 Ford F-150 4.6L would go to the defrost vents upon acceleration and back to vents when letting off the pedal. This was by far the best video I watched but upon inspection the plastic hose coming from the vacuum reservoir had a crack. The crack was only 4-5 inches from the check valve and easy to work on. I placed black tape over it for now until I can get some replacement hose. Took it for a test drive and it is working well until the long term fix can be put into place with new hose. I would still like to get a vacuum gauge and smoke machine because who doesn't like new tools. I want to say "still useful after 13 years" like everyone else but...that would be pointing out the obvious.
Great Job! I have a birthday on August 3, can you send me a smoke machine:) if not, is there any way a shade tree mechanic like me, make such a machine thanks again
Thanks for the detailed description and showing how the system works as a whole. Our 2003 Expedition initially started out as you explained where when going uphill it would quit blowing out the dash vents. Eventually it got to where it would only blow out the defrost no matter what position the control knob was in. I only had to watch the video up until you explained which line left the vacuum control valve and went through the firewall. I took a quick look at the line to see that it was cracked nearly through a few inches below the control. I cleaned both ends up the vacuum hose, slipped a short length of shrink tubing over one end, inserted the other end of the broken vacuum hose making sure to turn it so it would be in a position to reconnect to the control valve, then shrunk the tubing to seal the break. I'm not sure how long it will last but my guess is there's only a tiny amount of vacuum there to begin with. If it collapses I'll try again but make sure to double up the heat shrink. Last result would be to buy a coupling or completely replace the vacuum hose. But for now, it was a 3 minute free fix.
@@realfixesrealfast My wife confirmed that it worked well for several hours yesterday while they were out. My only concern as slight as it is, I think I got the vac hose ends where it was broken to touch inside the heat shrink before I shrunk it down. If not and there's a gap between the ends, I suppose the heat shrink could collapse eventually due to the vacuum. Thanks for the help.
I replaced heat blend door actuator last year and heat came back, but now ive discovered ac blows hot, and the cabin door in glovebox broke and fell down. I tried pinning it agaisnt the hole to cover it thinking its where heat is coming from. Whats weird is its sometimes cold until truck is warmed up. Any suggestions?
ruclips.net/video/9QwQN1DqWOk/видео.htmlsi=YdNZ_fi6cVVhgUVM On max a/c that door supposed to be fully open. Can't block it. Blocking it puts in on regular A/C . But that still isn't the problem of max AC not blowing cold. The blend door itself could be broken. Even if the actuator shows it moved it . And it's flopping around causing it to get cold then hot. Doesn't matter if the truck is warmed up. That's just when you noticed it.. do this in the video to see if the door is broken. You can do It. You got to
This is the best video I’ve seen on the vac system and how to properly diagnose it from under the hood to the cab ., what a money saver, experience pays , thank you so much for sharing this, well done sir 😊🙏👍💯
glad you liked it, thanks for commenting
Totally agree!! 👍
Very helpful, your a good mechanic. I'll try to remember what you taught me,
I
great instructional video. I like the vacuum test. thanks.
Outstanding! Thank you.
Does this same test work on the gas emissions with the evaporator control valve system on cars gas tanks?
I have this problem with my Expedition. Today it was exceptionally hot and as I went to l pass someone uphill I also list AC. When I got off freeway cold air started pumping again. I'm wondering if the heat came on at the same time.
keep this in mind. Heat is generated by combustion in the engine and is ALWAYS there. Heat is regulated by mixing hot air with cold air and controlled by "air blend doors. Cold is generated from the air conditioning compressor and is ONLY there when the compressor is running. That running is controlled by being turned on and off. It is regulated by couply different methods, air blend doors as well as variable valves internally in some newer designs os compressors.
@@realfixesrealfast Thank you
So how do you replace the vacuum line that goes through the firewall when it broke off from inside the firewall
@Sendthemeteormeow
To replace the old line, cut it either from the engine side of the firewall or the cabin side of the firewall. Then attach the new line to the old line and wrap it tight with electrical tape and slowly pull the old line with the new line attached to it through the firewall until you have enough line to make a proper reconnection. You may have to have someone assist by feeding and guiding the new line as it is being pulled through in order to avoid hang ups during the transition pull. Hope this helps.
Great video man. Great Information
Somebody is not paying this man enough money he is an awesome instructor very talented the way he explains the whole procedure where almost anyone can understand very impressive
Thank you Danny. I appreciate you recognizing the educational benefit
Agree 💯 %
What if my compressor turns on and fan but not cold and shoots thru the defrost same way as you fixed
11 years later and this video was still incredibly helpful. Thank you!
This was more helpful than anything else the search turned up. I should have known the older dudes always know what they're doing!
Glad it helped. Thanks for commenting
12 years later and you described our car's A/C problem. THANK YOU!
Thank you, I've been working on cars for years but I never really understood vacuum lines. after fixing the HVAC door on an Expedition because of your video, I feel more confident about the subject
The only video that followed the line I need to know thanks
Absolutely the best explanation I found in regard to vacuum leak and the hvac. Thank you for taking the time to do this.
Your welcome, and thanks for commenting
11 years later and this is still being used. Thanks for education! This is a great video!
Old timers would just blow smoke into the line with a cigar/cigarette but your fancy smoke machine is cancer free and prevents vehicle owner complaints of cig smell. 😆
You sir are a teacher, Thank You
Best HVAC controller troubleshooting video I have found.
Have to say your videos are some of the best I've seen on RUclips. Your presentation is outstanding. You have saved me a ton of money . I have to say if not a teacher you missed your calling. Thanks again.
You’re a Genius sir ! You’ve explained my situation perfectly. Now I know what my mechanic missed in his diagnosis. Wish you were my service guy. Thank you so much for your help and your knowledge.
Lo 😆
This is one of the best videos I've ever seen on this subject!! Very informative! Thank you SO MUCH for sharing your knowledge and experience with us!!
Thanks, I appreciate you taking the time to comment
Finally someone who knows what they are talking about. Thank you sir!
Sir, you are the very best instructer I've seen on this king of problem. Thank you so much, I might can fix my problem now, you may have saved me a lot of money. What you said made a lot of Sense to me, God Bless You, (Mac)
All this so you can operate the AirConditioning system with a turn nob dial? i dont entirely understand how this works But, i rather manually adjust the AC door with a lever than hav all this junk fail on me.
I have a 1968 f-250. Have had it for a long time. The newer the car the more technology's in it. My vent controls are run by mechanical linkage. Not by vacuum.
Correct! You don't understand.
I did learn apparently when there is no vacuum on these models the blend door defaults to defroster setting (so it seems that the default for vacuum based blend doors is 0 vacuum for defrost vent routing) ...All the other blend door positions for front , by feet ,...etc are a certain percentage of vacuum
Thanks, you clearly know your stuff!!! Fortunately I watched the second half of your video which addressed my issue with a 2003 Expedition. Before anyone loses heart because they don't have a vacuum gauge or smoke machine, take a look at the check valve and the connections to the feed lines, all 3 of mine were perished and had holes. Fortunately I had some spare line, cut 3 pieces and it is back to good health. Major points from the wife as it is her car. I got lucky, but apparently that is the most likely area to go wrong. Good Luck.
I become addicted to your video, every day i look for any new vidoes from you. One can understand why knowledge and experience is important from your videos. you are a role model to any one about how to diagnose and find probems, you make most difficult problem in to very simple one. Awesome, Great, Great.. i dont have words to appreciate you. You rock.
Brilliant video. You regularly find the huge gaps in my knowledge foundation.
Say, is there a "poor man's smoke machine" that anybody would suggest?
The same exact line broke completely off on my 2002 f 150, I found that out yesterday while I was putting the engine together hopefully for the first and last time. Great video.
Thanks for explaining the vacuum diagram, you certainly are a master in teaching, you saved me from doing unnecessary work.
It turned out to be the hose to the vacuum reservoir. Thanks 100%
Thank you for this video, and your other 3 part video on the heater blend door. Fortunately, this job was much easier than the heater blend door was. For other readers, if you have hot/cold problems it is the heater blend door. If you have A/C vents vs. Floor vents vs. Defroster vent problems, then this video applies. The heater blend door is electrically controlled by a servo motor. The A/C vent vs. Floor vents vs. Defroster vents are controlled by a set of vacuum motor servos (driven by engine vacuum). Usually, as shown here, the problem on the vacuum controlled motors is most typically the vacuum feed lines or vacuum resevoir or the vacuum check valve. (Occasionally the problem is the vacuum servo motor, but that is less frequent.) In my case, I bought a $15 vacuum gauge (Harbor Freight Tools), and was fortunate to have a "really" easy to find leak, that I could in fact hear with my ear. Listen for a hissing sound. If your leak is much smaller, or much larger, then you may not get a hissing sound, and then you need a smoke machine. You can make a smoke machine, there are RUclips video's on how to make a make-shift smoke machine. One version of it uses a small (low power tire filler type air compressor). You can also buy one of those air compressors at Harbor Freight tools for cheap, but the other parts of the make-shift smoke machine you have to make, and it takes a while. I have one I made from a metal "jar" some Harbor Freight Tool air compressor line fittings, a bit of wire mesh I had sitting around, and some charcoal brickets and some cardboard (cardboard makes good smoke), brickets stay hot under low air compression.
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Couldn’t have done without you. Took me directly to the root cause. Deteriorated hose at the check valve. Replaced the hose and back in business. Thank you!
Where did you find the replacement hose? I can't find any.
Great diagnostic instruction for both intake source line and component lines downstream. Thank you.
I love it when videos explain how the system works instead of just showing what you replaced to fix it. My 2003 f150 was not switching off of defrost ever and I found that the hose on the intake side of the check valve had cracked. Replaced it and boom fixed. Thanks again!
your welcome, thanks for commenting
Thank you so much I just spent 3 hrs under the dash getting to my ac door actuator only to find out mine works just fine, the 2nd part of this awesome video was my exact issue!
You are a fkn legend!
God bless you.
I'm h a ving this problem with the AC only coming out of the defroster. I had this problem years ago on a 82 F150. All I had to do was put 2 hoses back on 2 nozzles that was at the back of my engine compartment. Fixed the problem right away. But now, I have no idea what to do & I'm not able to figure it out! But I did suspect a vacuum leak right away! Very sad that I don’t have my mechanic/husband here to help!
Simply amazing explanation. You took a lot of the mystery out of vacuum lines and check valves. Smoke machine really cool. Excellent troubleshooting and repair. Just subbed.
Best and cleanest fix I’ve seen yet. Thanks for the video, I’m going to do this exactly.
Excellent video! I had the same exact problem on a Ford Van about a year ago. It turned out to be the same exact vacuum hose! Maybe a pattern failure? Thanks for posting this and all your videos. Good job, carry on!
What if you have no air flowing from the front vents at all? I don't notice any airflow on any fan setting, AC, heat, or defrost. Has it still defaulted to defrost? I have replaced the 3 AC fuses under the steering wheel, the blend door actuator relay, the blend door actuator, the blower motor, and the resistor. Still no air flow. 2001 excursion 7.3 2wd. Rear ac blows cold. No air flow at all to the front. I'm going to try this vacuum diagnosis and see what happens. Best video I've ever seen, great teacher.
Thanks much for posting these videos!
Just curious shouldn't you have pinched off the engine vacuum and the line running to the reservoir to narrow it down to the line it ended up being? Your gauge shouldn't have dropped because you still had engine vacuum when you blocked the reservoir. Regardless very helpful video thanks for taking the time to make it.
I've been watching mickey mouse fixes bit this is exactly what I wanted. A 100% fix and it's pretty simple 👍 tysm for the educational video!
I have a different issue: I have air coming out of the defrost, middle, and floor vents at the same time. When I raise the temperature, the passenger side gets hot but the driver side remains cold. Any suggestions? I have a 99 Buick Regal.
Great info! Would it still be the same issue on a 2015 Nissan Murano? When I first start my SUV, even if the vents are on head, they do not blow any air. The system will SOUND like it is blowing, and as you turn up the flow, it sounds louder, so it is working. However, air doesn't come out. The only way I can get the air to start coming out of the head vents is to turn the vent to front defrost, listen for a little clicking sound indicating the air is then blowing into the windshield, then I can turn it back to head vent, and it blows from those vent. Is that an actuator issue?
Awesome video. You helped me fix my problem. Thank you.
Hi had smoke test done couldn't find the leak paid $50.00 buck for nothing, I have a 1993 Pontiac Bonneville se plus I was trying to tell my repair it control panel doesn't make the little blow noise when you are changing the mode you have vacuum leak right?
My problem is that it will go to floor and vent but not defrost. When I turn the mode dial, and place my hand on top of the vacuum motor, you can feel the plunger moving up or down when you turn it to floor and vent, but when you turn to defrost, the plunger doesn't move. I tried a new vacuum motor, but it did the same thing. I tried a new HVAC control panel, but that didn't help either. Vehicle is 2001 F150. Any suggestions would be appreciated. Thanks!
😂😂😂😂 this video found me understand I been looking for what this part was gave up then boom it pops up
how do you re vacuum the canister? I replace that small hose that goes in the fire wall and now it will switch from defrost to floor but not to vents if it goes to the floor it must have vacuum right? Where does that line connect on the control panel?
Can someone help me please? I have a 2000 Grand Marquis and it blows out only through the vents and not a lot of air. I had the ECC rebuilt and now I do get a bit of air through the proper vents called for at times but only a trickle like if I put on defrost then barely comes out and most through the vents. I think I am not getting enough vacuum. All vacuum motors seem good when I tested them Please help.
Ok boys, i had the same issue, mine wasn't as easy to find . This is if the issue happens under a load.
So, to save you A LOT of money, if it's not under the hood, chances are they same line going into the firewall, that's behind the glove box is damaged.
Remove the glove box, and right next to the fender you'll see that the line is rubbed.
Thanks been driving me nuts thinking it was electrical and hello from Las Vegas millwrights .ps about your smoke can you show us infidels please
Una pregunta mi troca tiene esas mangueras desconectadas bueno están cortadas es una ford expedición 2003 4x4
Yes, the absolute best video on this subject . Hope it helps with my problem. Thanks !!!
Thanks for demonstrating the diagnostic approach and smoke test !
Awesome video. I have a Ford Windstar that keeps defaulting to the defrost vents. Now I know what to look for! Thanks, you guys rock.
I have a 2003 f150 4.6... my problem is at idle whenever I turn on the a/c or heater the engine revs, I have checked for leaks with a smoke machine and found no leaks, it only rev with a/c or heater it revs more when I have the setting at panel/floor not so much when the setting is at floor
I was having issues with my 98 Cherokee and it turned out that the vacuum line was gone from where the hose gets smaller after the T down to a few inches before the firewall. I have some hoses and I wanna see if it’ll help fix the lack of power too since it’s complete open with a 1/8” hole.
@realfixesrealfast - Sir why does the manufacturer connect the a/c vent doors to the vacuum? Why does the vacuum something to do with the air door control system? I thought everything is manually controlled at the knob on the dashboard?, Thank you Sir.
They should make all the vacuum plumbing out of thick walled stainless hardlines.
What kind of hose did you replaced it with and where can I buy some?
When this guy say's there is only 3 pounds of vacuum, he's incorrect, vacuum is measured in inches of Mercury, what he should have said was there is only 3 inches of vacuum
Thank you for such a good explanation. Now I can fix my truck!!!
Thank you so much. This video is not appreciated enough. I think should add some ford f150 and expedition tags and also to title
Great video! Opened the hood of my 97 F-150 and had an idea what to look for. The line from the reserve tank was broken and when I tried to disconnect lines from the check valve, it fell apart. All 3 ports just snapped off. Got a new check valve at the auto parts store and connected all the hoses and now I can step on the gas and the AC stays on the vents. Thank you so much.
Ok but there is a red line and black one on my vc can. My problem I have 2 broke lines in wire loom I h a ve a white and black coming from the cab also the blend door line is broken where does the can lines go and the white and black please help.
I have a 2005 ford expedition eddie bauer , i need help on reputting mines back together with the switch in the corner
Awesome I believe I can fix my truck now...wish I had a smoke machine, Where can you get the repair vacuum hose
Outstanding video. Very helpful, especially the vacuum-check valve and checking for broken vac lines.
Really enjoyed watching your video I dont know any mechanics in europe to have a smoke machine , ive heard of them. Now i want one hope they are not too expensive. Great Video Top mechanic !!!
what smoke machine is that and what range does the gauge has to have? 30hg?
2001 Ford F-150 4.6L would go to the defrost vents upon acceleration and back to vents when letting off the pedal. This was by far the best video I watched but upon inspection the plastic hose coming from the vacuum reservoir had a crack. The crack was only 4-5 inches from the check valve and easy to work on. I placed black tape over it for now until I can get some replacement hose. Took it for a test drive and it is working well until the long term fix can be put into place with new hose. I would still like to get a vacuum gauge and smoke machine because who doesn't like new tools. I want to say "still useful after 13 years" like everyone else but...that would be pointing out the obvious.
glad it helped, thanks for commenting
Excelente, muchas gracias. Muy instructivo.
My 2000 Monte has air blowing out all three vents. Nothing happens when i rotate the selector switch.
Thank you for making this video I have the same problem with my 2002 Ford F-150
Thank you I have the same issue :)
Hey Wayne (I think that’s ur name ). What is a good vacuum gage ??
Well, i looked all over the place for some help,and you just covered most of it, Damn Vacuum.. I hate'um..
Great Job!
I have a birthday on August 3, can you send me a smoke machine:)
if not, is there any way a shade tree mechanic like me, make such a machine
thanks again
Well done... Great teaching style and very clear instructions. Thanks
So there's only one vacuum line going into/ coming out of the vacuum reservoir?
This man is SOMETHING ELSE!!! Can he come live with us!!! I hope this generation has half the sense he has!!
Thanks for your comments, I appreciate them
I'm trying to find a video how to replace the tubing that goes into the firewalls
Very good information
Still chasing my vaccum leak
Thanks for the detailed description and showing how the system works as a whole. Our 2003 Expedition initially started out as you explained where when going uphill it would quit blowing out the dash vents. Eventually it got to where it would only blow out the defrost no matter what position the control knob was in. I only had to watch the video up until you explained which line left the vacuum control valve and went through the firewall. I took a quick look at the line to see that it was cracked nearly through a few inches below the control. I cleaned both ends up the vacuum hose, slipped a short length of shrink tubing over one end, inserted the other end of the broken vacuum hose making sure to turn it so it would be in a position to reconnect to the control valve, then shrunk the tubing to seal the break. I'm not sure how long it will last but my guess is there's only a tiny amount of vacuum there to begin with. If it collapses I'll try again but make sure to double up the heat shrink. Last result would be to buy a coupling or completely replace the vacuum hose. But for now, it was a 3 minute free fix.
I'm glad it worked for you. But I really impressed that you took the time to think thru your problem and then locate the fault. Great work.
@@realfixesrealfast My wife confirmed that it worked well for several hours yesterday while they were out. My only concern as slight as it is, I think I got the vac hose ends where it was broken to touch inside the heat shrink before I shrunk it down. If not and there's a gap between the ends, I suppose the heat shrink could collapse eventually due to the vacuum. Thanks for the help.
@@IRBent2 Congrats on finding the problem. If it fails again you know where to look ! ! Shrink tube has worked for five years so far on my truck.
2001dodge AC vacum line broke st firewall
What a great video ! This has helped me fix my dakota
I replaced heat blend door actuator last year and heat came back, but now ive discovered ac blows hot, and the cabin door in glovebox broke and fell down. I tried pinning it agaisnt the hole to cover it thinking its where heat is coming from. Whats weird is its sometimes cold until truck is warmed up. Any suggestions?
ruclips.net/video/9QwQN1DqWOk/видео.htmlsi=YdNZ_fi6cVVhgUVM On max a/c that door supposed to be fully open. Can't block it. Blocking it puts in on regular A/C . But that still isn't the problem of max AC not blowing cold. The blend door itself could be broken. Even if the actuator shows it moved it . And it's flopping around causing it to get cold then hot. Doesn't matter if the truck is warmed up. That's just when you noticed it.. do this in the video to see if the door is broken. You can do It. You got to
RUclips is God sent
by chance what is that plastic line that goes into the firewall to the dash? what is it called?
Thank you so very much sir. You fixed the problem
That smoke machine is pretty cool, I wonder where to get one and what they cost.
An excellent no-nonsense walk through. Thank you.
Erik Davis
yup
What about when the door that controls temperature is stuck on cold? Where are the lines for that?
Thank you for your time than you for your knowledge 👍
thank u!
this happens to my 89 Lincoln Town Car
Thank you for this video. It saved me a lot of trouble and headaches.
Mi truck has the problem went the het is on the AC compressor kik on
This guy is awesome, and the Earth is flat