As a temporary emergency repair, i was stuck in the woods and needed 4 WD. Pulled battery and removed cable from actuator, pulled on cable and held it out with a pair of vice grips, got out of the ditch, went home found your vid and got the repair done. thanks!
@AWLs7 that's cool you did that not cool you had to do it. I swapped my personal blazer over to a lever and ran cable into driver area. The new vacuum diaphragms kept busting. Make sure you carry a spare and thanks for watching and subscribing to my channel. There are other blazer videos in my playlists titled "Blazer"
G'evening & Great job ☕☕ 🤠 . I've been turning wrenches for 20+ yrs myself. However I bought my first S10. A 98' Blazer 4Dr 4wd & I really appreciate the refresher course on the vacuum 4wd system. It may be 70's AMC Jeep tech but when it works right it's great 🙃🙃 ..
@@stevenengland9832 On my 98 Blazer the actuator is underneath the battery tray in the front passenger corner. Rather than trying to take the three little machine screws that hold the actuator to the bracket, there are two bolts that hold the bracket in place and you can take the nuts off the bolts that hold the bracket in place from inside the wheel well right in front of the tire. The cable hooks to the actuator and there's also a vacuum line that plugs into the actuator as well that should have been right by the actuator can. I haven't traced the whole system out as of yet but the cable runs down to the differential on the front axle to engage and disengage it. And vacuum line should run from the actuator canister down the passenger fender to the firewall and across and down to the vacuum actuator switch on the transfer case. There should be three vacuum lines on the vacuum actuator switch on the transfer case. One should go to the actuator canister under the battery tray. Another one should go to the push button in the dash for the four-wheel drive and I think the third one should go to engine vacuum probably on the intake manifold or possibly the throttle body. You can replace the old style rubber vacuum lines with the newer high temperature silicone vacuum hoses and you'll be glad you did. I hope this helps and I found quite a few videos on RUclips about it
Thanks guy, needed this info i had some vac. Lines rotted out on too of the t case, now i know where they go. The vsc. Line size info was helpful too fasho!
@@dragsterstransmissions awesome thank you ya I've just been trying to figure out where all the hoses go because mine are rotted always like to search RUclips first so thanks again.
I have a couple questions that i wish i could get your imut on but id like to say good job on the video and breaking it down first of all. But so I have been fighting a 94 s10 that has only the 4hi - 4lo push button switch located on the left side of the instrument panel... never have I ever had a problem with the 4 wheel drive until... boom... when needed all that would happen is you would hear the transfer case acting like it wants to engage but then would.just stay in 2wd. After watching your video... sure as hell, that switch was sticking and fluid came draing out of all the lines.. I bought all new lines and switch and also diaphragm ( that was torn as well) and checked the cable that goes to the axle and it was freed up but im wondering if its not kinked somewhere ( im going to look into that yet tonight and hope thays it. But with all that switched out it still did the same thing, so my other question is the 3 way check valve that splices in with the vacuum from the air Intake? Or can I bypass them? I've looked through the entire Chiltons book and couldn't find anything ( or I didn't understand something) thank you for your time, I will update asap
It's possible that the little clip inside of the axle itself is broken. I had that happen on my 86 s10. Cable would move but wouldn't activate the gear in the axle.
Replacing the lines & the 4WD Vacuum Switch “should” cure a high idle & a harsh shifting as well; is what I was told? Correct? Awesome video! Very helpful, thanks 🤘🏻
Like the video. A question though. Is your diagram a view at the end of the collector lug where all the hoses connect or looking at the top of the vacuum switch? Because these two views would be a mirror image of one another about a vertical line and I just want to be sure. Thanks for any clarification you can provide.
In my case I’m thinking it’s a mirror because my lines aren’t lining up with what he’s saying. Then again I’m working on a 92 s10 rather than the later models like he explained in the video
@Jim Sale yep mine are mirrored to this diagram. 89 s10 blazer. So looking down at the switch. Pin center and away from you. Its actuator towards you. Vent upper right, engine upper left. When I did it his way I had vacuum in 2wd and nothing in 4wd.
Great video but I did not see where you covered the electric solenoid switch that allows vacuum to pull on the diaphragm vacuum switch cable. Also no mention of the vacuum orb and where it is located
Oh gosh there's so many forms and videos about how bad of a design this was by Chevy but if you're going to give a summary of the vacuum lines isn't there an orb that stores the vacuum? Also there is a solenoid that screws into the top of the intake that has the two wires coming off of it that actually open that solenoid to allow vacu the vacuum path when it is called for on four-wheel drive operation.@@dragsterstransmissions
@@dragsterstransmissions OK my factory switch has an o-ring, and I just thought no one else has mentioned one so I should be ok. I just put it together so we’ll see haha thanks for the prompt reply and you certainly do the Best video on this topic thanks for taking the time
Hello there. I have followed hoses from the port as you’ve shown…. The hoses are all broken underneath the transmission. Don’t know where to go from here
ive got a cable AND a vaccum hose both coming from that accuator under the battery anyone know where that hose is supposed to go? the cable is connected right but can't seem to find where this hose goes bough truck second hand and some genius just had it capped
I am also having this 4x4 problem does not engage. But am wondering how many components should I look over ? My Vacum diaphragm under my battery works and what you are now showing I need to install yet. It is in a rough spot hard to get ahold of for sure.
@Jimmy Hamm start with the vacuum related components first. Such as the hoses themselves probably should replace the hoses. I got another video in my playlists titled blazer repairs. Also check transfer case fluid level by removing top plug in back of case.. if fluid gush out you will have to replace front seal in case.. Keep me posted on your progress
@@dragsterstransmissions Thank you much good sir I just got a 96 Sonoma high rider last yr. I knew had problems the ligh just flashes at me on my panel . It drives. I have replaced all fluids except transfer case . Thank you much on your advice on my question. Illinois is 🥶 now . I will get back to you on my progess.
Getting ready to redo my 4wd system on my '99 Blazer, this was perfect timing to see.
As a temporary emergency repair, i was stuck in the woods and needed 4 WD. Pulled battery and removed cable from actuator, pulled on cable and held it out with a pair of vice grips, got out of the ditch, went home found your vid and got the repair done. thanks!
@AWLs7 that's cool you did that not cool you had to do it. I swapped my personal blazer over to a lever and ran cable into driver area. The new vacuum diaphragms kept busting. Make sure you carry a spare and thanks for watching and subscribing to my channel. There are other blazer videos in my playlists titled "Blazer"
So I got an s10 that’s just a farm truck could I just use vise grips and leave it like that?
Don't see why not just don't forget to un do it if you shift out of 4WD.
I have looked for over a year trying to figure out the placement of those vacuum hoses thank you very informative
Thank you! This video was exactly what I needed to get going before the snow comes!
Thank you! Thanks to this video I found the hose to the actuator had come off. Mine is an 87 s10 pickup, these directions worked great for it too!
Thank you! Very helpful for people like us that just keep fixing our old rides
G'evening & Great job ☕☕ 🤠 . I've been turning wrenches for 20+ yrs myself. However I bought my first S10. A 98' Blazer 4Dr 4wd & I really appreciate the refresher course on the vacuum 4wd system. It may be 70's AMC Jeep tech but when it works right it's great 🙃🙃 ..
Where at exactly on the actuator does the vacuum go because on mine there was just the screw in cable?
@@stevenengland9832
On my 98 Blazer the actuator is underneath the battery tray in the front passenger corner. Rather than trying to take the three little machine screws that hold the actuator to the bracket, there are two bolts that hold the bracket in place and you can take the nuts off the bolts that hold the bracket in place from inside the wheel well right in front of the tire. The cable hooks to the actuator and there's also a vacuum line that plugs into the actuator as well that should have been right by the actuator can. I haven't traced the whole system out as of yet but the cable runs down to the differential on the front axle to engage and disengage it. And vacuum line should run from the actuator canister down the passenger fender to the firewall and across and down to the vacuum actuator switch on the transfer case. There should be three vacuum lines on the vacuum actuator switch on the transfer case. One should go to the actuator canister under the battery tray. Another one should go to the push button in the dash for the four-wheel drive and I think the third one should go to engine vacuum probably on the intake manifold or possibly the throttle body. You can replace the old style rubber vacuum lines with the newer high temperature silicone vacuum hoses and you'll be glad you did. I hope this helps and I found quite a few videos on RUclips about it
Sir I've been tubing for a long time. Just to let u no that u do a dam good job on explaining the job on hand 👌
@James Farrar
Awesome thanks for watching my videos.
Thanks guy, needed this info i had some vac. Lines rotted out on too of the t case, now i know where they go. The vsc. Line size info was helpful too fasho!
Finally!!! After days of searching!! Thanks !!
great vid thank you for taking the time and explaining it all
@Christopher Galbraith I have other videos in my playlists titled "Blazer" I show more of the 4x4 stuff
@@dragsterstransmissions awesome thank you ya I've just been trying to figure out where all the hoses go because mine are rotted always like to search RUclips first so thanks again.
This helps me a lot thanks
Very nicely done.quite clear and very informative.
Thank you sir, very informative and I truly appreciate it.
Great Video. Thank you!
Very helpful thank for this... Trouble finding sources for this info
@will c no problem and I have more videos in my playlists titled "Blazer" that will help out also.
Your video is so helpful thank you so much
Excelente explicación
Gracias desde Costa Rica
Thank you! Well done
very nicely explained thank you
I have a couple questions that i wish i could get your imut on but id like to say good job on the video and breaking it down first of all. But so I have been fighting a 94 s10 that has only the 4hi - 4lo push button switch located on the left side of the instrument panel... never have I ever had a problem with the 4 wheel drive until... boom... when needed all that would happen is you would hear the transfer case acting like it wants to engage but then would.just stay in 2wd. After watching your video... sure as hell, that switch was sticking and fluid came draing out of all the lines.. I bought all new lines and switch and also diaphragm ( that was torn as well) and checked the cable that goes to the axle and it was freed up but im wondering if its not kinked somewhere ( im going to look into that yet tonight and hope thays it. But with all that switched out it still did the same thing, so my other question is the 3 way check valve that splices in with the vacuum from the air Intake? Or can I bypass them? I've looked through the entire Chiltons book and couldn't find anything ( or I didn't understand something) thank you for your time, I will update asap
It's possible that the little clip inside of the axle itself is broken. I had that happen on my 86 s10. Cable would move but wouldn't activate the gear in the axle.
I am also having problems and not much detailed help, so anything helps!!....Going thru whole system....PIA...
Great Help!!....Thanks!!!
Replacing the lines & the 4WD Vacuum Switch “should” cure a high idle & a harsh shifting as well; is what I was told? Correct?
Awesome video! Very helpful, thanks 🤘🏻
@TonyMitch13
Yes vacuum hose(s) cause high idle as well as throttle body and upper intake plenum gaskets. Does your 4x4 work when you push the button
Very helpful thanks
Thank you brother ☝️
Like the video. A question though. Is your diagram a view at the end of the collector lug where all the hoses connect or looking at the top of the vacuum switch? Because these two views would be a mirror image of one another about a vertical line and I just want to be sure. Thanks for any clarification you can provide.
Did you find out if this clip is right or mirrored?
In my case I’m thinking it’s a mirror because my lines aren’t lining up with what he’s saying. Then again I’m working on a 92 s10 rather than the later models like he explained in the video
@Jim Sale yep mine are mirrored to this diagram. 89 s10 blazer. So looking down at the switch. Pin center and away from you. Its actuator towards you. Vent upper right, engine upper left. When I did it his way I had vacuum in 2wd and nothing in 4wd.
Did any of you all put an o-ring on the bottom of threads on your new transfer case switch or did you just screw it on and hook it up?
The video is incorrect. The diagram is correct looking into the end of the vacuum hoses, not looking down onto the top of the switch.
Very helpful Thank You!!!
Great video but I did not see where you covered the electric solenoid switch that allows vacuum to pull on the diaphragm vacuum switch cable. Also no mention of the vacuum orb and where it is located
@richardsilva5134 check out the playlists titled "chevy blazer 4x4 problems"
Oh gosh there's so many forms and videos about how bad of a design this was by Chevy but if you're going to give a summary of the vacuum lines isn't there an orb that stores the vacuum?
Also there is a solenoid that screws into the top of the intake that has the two wires coming off of it that actually open that solenoid to allow vacu the vacuum path when it is called for on four-wheel drive operation.@@dragsterstransmissions
Good Video, A Lot Information We Need For A Little Problem. Thanks.
I took my vacuum canister out of the fender well and it was full of transfer case oil. I shaked it all out and relocated it. Why was it full
Great info! If you can recall, did you reuse the stock vacuum plug/receptacle or just push tubes straight onto the switch? Thanks for the video.
@Shannon Hukill
Put hoses on switch vacuum plug was bad. Color coded hoses and nipples on switch with paint markers
@@dragsterstransmissions 10 - 4 appreciated 👍
Good video
@Jack Neck
Thanks for watching
En español
@@eliscriollo are you saying you watched my video in Spanish?
This is a great video thank you sir! On the switch itself did you replace the o-ring?
@john rose
I don't recall an oring
@@dragsterstransmissions OK my factory switch has an o-ring, and I just thought no one else has mentioned one so I should be ok. I just put it together so we’ll see haha thanks for the prompt reply and you certainly do the Best video on this topic thanks for taking the time
Would you do one for 98-04 GMC jimmy? They are slightly different thru those years with each other
@@rocketqueenone if and when I get one in for repair
Thank You,I just got My 1996 Blazer today and I'm not sure if my 4x4 is working or not,I'm A older disabled man and I Need ALL The Help I Can Get :0 (
Hello there. I have followed hoses from the port as you’ve shown…. The hoses are all broken underneath the transmission. Don’t know where to go from here
Where EXACTLY does engine port vacuum go to on an S10 ZR2????
many tks.. now will be easyer the Chevy reparation !!
ive got a cable AND a vaccum hose both coming from that accuator under the battery anyone know where that hose is supposed to go? the cable is connected right but can't seem to find where this hose goes bough truck second hand and some genius just had it capped
@Kevin McCormick
To the vacuum switch on top of transfer case. Provided you are working on a s10 platform you didn't specify but it sounds like it
I am also having this 4x4 problem does not engage. But am wondering how many components should I look over ? My Vacum diaphragm under my battery works and what
you are now showing I need to install yet.
It is in a rough spot hard to get ahold of
for sure.
@Jimmy Hamm start with the vacuum related components first. Such as the hoses themselves probably should replace the hoses. I got another video in my playlists titled blazer repairs. Also check transfer case fluid level by removing top plug in back of case.. if fluid gush out you will have to replace front seal in case.. Keep me posted on your progress
@@dragsterstransmissions Thank you much good sir I just got a 96 Sonoma high
rider last yr. I knew had problems the ligh just flashes at me on my panel . It drives.
I have replaced all fluids except transfer
case . Thank you much on your advice on
my question. Illinois is 🥶 now . I will get
back to you on my progess.
I put you on my likes good explanation videos are a must.
I have a problem with transmission fluid causing the vacuum hose to swell, will a bad switch cause this problem??
@@kiddbrother3 it can if the switch is leaking fluid past the ball inside
@@dragsterstransmissions the vent hose from the 3 port switch connectors to transmission vent? Should be vented to the atmosphere? Correct!?
Thanks
I have oil in the vacuum lines is this it
@cognac8297
Oil or transfer case fluid?
@@dragsterstransmissions transfer case fluid a little bit
@cognac8297 then yes its time for a new vacuum switch