Just a side note, I have worked on several of these gm products with the almost identical issue. What it ends up being is a thermostat set with a p0128 code for thermostatic efficiency. On all of these cars, if you cleared the codes and repaired the thermostat, the ac system worked correctly. I have seen this with the engine light off and the code only in pending. GM shuts off the ac when the ecm detects and issue with the thermostat, regardless of it being and under temp issue. Always check the codes before getting too deep into these gm systems.
Thank you sir, your direct approach to accurate and thorough electrical diagnostics have helped me countless times throughout the years and I just wanted to say I appreciate what you do here. Electrical diag really is true detective work - as long as you understand how the system operates. We need more technicians like you in the field.
I'm not sure if u actually eat something, digest it, and end up with all this knowledge or if u spend all day reading material to supplement ur already vast know how......what a great video....ill give it a whirl n try get this a/c going....thank u, kind sir
Disconnecting an end device, then applying power directly seems like a good diagnostic approach, but to my surprise I find that professionals often go at it from a different angle. The trick is to find all of those relays, sensors, diodes, and fuses, which can be time consuming for guys who don't work in the industry. As always I like your approach to get the wiring diagram and systematically look for power and ground at midpoints in the pathway, dividing the problem to quickly zoom in to the problem area. My first thought was undercharge causing a veto from a low pressure sensor, but it couldn't be too low, otherwise he wouldn't have cooling with compressor on. Likewise if the flyback diode was bad the clutch wouldn't likely engage with hotwired power. I'd be checking codes and real time data to see if a scanner can offer clues, then probably go to the relay, low pressure sensor, and system pressures. Good to have you back!
I learned the great things about this video, I repaired my car's air conditioner. Can you help me with the standard refrigerant charging method for each type of car. Thank you very much.
Always great videos and thank you for sharing your great wealth of knowledge- glad to See you Again Hope recovery going well - wishing you great health for years to come
Thank you sir for your explainations. Great vidéo. I just have 2 questions : 1. First you said at 5:39 that " if the system works, that means fuse #23 is good. But i can read on the diagram that if the A/C cluch coil is directectly fed and the crank working, the compressor could run directly and cool the car. All the line from the battery to the PCM is no more necessary. I mean the good state of that fuse is not proven. 2. How does the cooling temperature is set by the passanger when je turn the A/C button ? Thank you agian for your great work.
When I turn on the AC in my 2009 Chevy HHR it does not blow cold air. If I turn temp control to warm it will blow warm air. Mileage is 147,000. The compressor is running when I turn on the AC, max AC cool, full fan, and recirculate. I purchased the A/C Pro R-134a recharge kit ACP-100V. With the AC running I connected just the gauge from the recharge kit. Outside temperature is about 57 degrees F. It shows in the green filled area - around the 30 PSI section. I have not connected the gauge to the tank to add. I am wondering if I should proceed with attempting to add refrigerant. Please advise.,
Victor M Coria Watch his series on reading electrical diagrams. I learned so much and I too am weak in the electrical area. His explanations and details are awesome for a learning mind. Seriously, he starts simple and breaks it down.
If you can one tip,in my ford fiesta 1.3 2004 ac stopped working the gas was filled to specification,on cotrol side of compressor and fan relay there is no ground,ie they do not get a signal form pcm wath should do THANKS YOU in advance
Hi.....top mechanic Duane.... 2002, 1500 Silverado....a/c cools but refuses to cycle .....new orifice tube...proper amount of 134A...how do i confirm that my high n low switches r doing they're job
good question. Check your diagram to be sure but most high & low pressure switches are "normally closed" which means they allow power to flow thru them. Then if the pressure gets either too high or too low that switch will open and not allow power to flow and the clutch will either not engage or shut off. Also if the switch is unplugged from the circuit it should have continuity until the pressure opens it.. Hope this helps.
Do you have any ABS or check engine lights on? Do your brake lights work when pressing the pedal? Is there a remote start tapped into any of the brake switch wires that you could remove for testing? Does your speedometer work properly? All these things are related to the system. If you could get a wiring diagram and follow it like Duane did in the video you would be headed in the right direction instead of throwing parts at it. Good luck
Thank God for guys like you! Awesome video, educational as always, and so happy to see you still are making excellent videos! Thanks again!
Just a side note, I have worked on several of these gm products with the almost identical issue. What it ends up being is a thermostat set with a p0128 code for thermostatic efficiency. On all of these cars, if you cleared the codes and repaired the thermostat, the ac system worked correctly. I have seen this with the engine light off and the code only in pending. GM shuts off the ac when the ecm detects and issue with the thermostat, regardless of it being and under temp issue. Always check the codes before getting too deep into these gm systems.
Those 3 dislikes are people that run an A/C shop..
Thank you sir, your direct approach to accurate and thorough electrical diagnostics have helped me countless times throughout the years and I just wanted to say I appreciate what you do here. Electrical diag really is true detective work - as long as you understand how the system operates.
We need more technicians like you in the field.
Thanks you, I appreciate your comments
Love your instruction using wiring diagram breakdowns. Please continue with this type of instructional video. Thanks again.
Your videos are always interesting and informative. Thank you for sharing. You are looking well. It is nice to see again.
I'm not sure if u actually eat something, digest it, and end up with all this knowledge or if u spend all day reading material to supplement ur already vast know how......what a great video....ill give it a whirl n try get this a/c going....thank u, kind sir
A very invaluable and information step by step video, good to see you back.
Great explanation of the AC system. Just what I needed. Thank you for your great video's
Thank you Duane. Good job. I appreciate your videos. Have a blessed and safe week.
Disconnecting an end device, then applying power directly seems like a good diagnostic approach, but to my surprise I find that professionals often go at it from a different angle. The trick is to find all of those relays, sensors, diodes, and fuses, which can be time consuming for guys who don't work in the industry. As always I like your approach to get the wiring diagram and systematically look for power and ground at midpoints in the pathway, dividing the problem to quickly zoom in to the problem area. My first thought was undercharge causing a veto from a low pressure sensor, but it couldn't be too low, otherwise he wouldn't have cooling with compressor on. Likewise if the flyback diode was bad the clutch wouldn't likely engage with hotwired power. I'd be checking codes and real time data to see if a scanner can offer clues, then probably go to the relay, low pressure sensor, and system pressures. Good to have you back!
I learned the great things about this video, I repaired my car's air conditioner.
Can you help me with the standard refrigerant charging method for each type of car.
Thank you very much.
Always great videos and thank you for sharing your great wealth of knowledge- glad to See you Again
Hope recovery going well - wishing you great health for years to come
Excellent explanation
As always, Thank You Sir.
big fan of u.u are a great teacher.thanks
Nice job with the system explanation Duane.
Excellent video! Great instruction. Thank you.
Excellent. Explanation teacher. Nice video. Salude noel Matute de California
any electrical help would be great. it's really my weakest area.
Thanks u sir for great tutorial videos👏
Thank you sir for your explainations. Great vidéo.
I just have 2 questions :
1. First you said at 5:39 that " if the system works, that means fuse #23 is good. But i can read on the diagram that if the A/C cluch coil is directectly fed and the crank working, the compressor could run directly and cool the car. All the line from the battery to the PCM is no more necessary. I mean the good state of that fuse is not proven.
2. How does the cooling temperature is set by the passanger when je turn the A/C button ?
Thank you agian for your great work.
Great!!!! The learning continues..thanks
Hi Larry, by the way, my next video will be on your throttle motor. Hopefully soon.
Well done as always.
always Like your videos boss 👍
Good to see you. Thanks
Good to see u doing well sir hope ur health is better
DUAN, awesome\excellent and thank you for what you do always enjoy ur videos. cheeeeers
Great to see you! Nice job as always!
AWSOME VIDEO 👍 👍, THANK YOU
What a fantastic explanation! Thanks!! 👍👍
When I turn on the AC in my 2009 Chevy HHR it does not blow cold air. If I turn temp control to warm it will blow warm air. Mileage is 147,000. The compressor is running when I turn on the AC, max AC cool, full fan, and recirculate. I purchased the A/C Pro R-134a recharge kit ACP-100V. With the AC running I connected just the gauge from the recharge kit. Outside temperature is about 57 degrees F. It shows in the green filled area - around the 30 PSI section. I have not connected the gauge to the tank to add. I am wondering if I should proceed with attempting to add refrigerant. Please advise.,
thank you sir
☆☆☆☆☆5s thank you for this video. There is any book or videos that can help to learn how to read only electrical diagrams?
Victor M Coria Watch his series on reading electrical diagrams. I learned so much and I too am weak in the electrical area. His explanations and details are awesome for a learning mind. Seriously, he starts simple and breaks it down.
Thank you Ryan, thanks a lot.
If you can one tip,in my ford fiesta 1.3 2004 ac stopped working the gas was filled to specification,on cotrol side of compressor and fan relay there is no ground,ie they do not get a signal form pcm wath should do THANKS YOU in advance
You will need to describe the situation in more detail
Hi there, how can I contact you for help on a puzzle :-)
Send the information to my email. dumar5907@@gmail.com
Hi.....top mechanic Duane....
2002, 1500 Silverado....a/c cools but refuses to cycle .....new orifice tube...proper amount of 134A...how do i confirm that my high n low switches r doing they're job
good question. Check your diagram to be sure but most high & low pressure switches are "normally closed" which means they allow power to flow thru them. Then if the pressure gets either too high or too low that switch will open and not allow power to flow and the clutch will either not engage or shut off. Also if the switch is unplugged from the circuit it should have continuity until the pressure opens it.. Hope this helps.
I have a 2000 Honda CR-V , cruise control not working. I replaced switch and control module
Do you have any ABS or check engine lights on? Do your brake lights work when pressing the pedal? Is there a remote start tapped into any of the brake switch wires that you could remove for testing? Does your speedometer work properly? All these things are related to the system. If you could get a wiring diagram and follow it like Duane did in the video you would be headed in the right direction instead of throwing parts at it. Good luck
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It’s winter ❄️ just turn the fan on outside air.