Question about 1991 Chevrolet S-10

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I have a 1991 chevy S10 automatic with 4WD. It will not engage into 4WD. Where is the vaccum switch located on the transfer case?

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Do you have a repair manual for the truck?

a must have and a good $20 spent.

Posted on Feb 16, 2009

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Posted on Jan 02, 2017

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94 S10 Blazer, 4X4 , has a high low rocker switch, which i hate, it wont engage in 4wd mode, how does that stupid switch work ?, Vaccum ?


You will probably need a shop manual to work on it yourself. The switch on the dash controls a vac servo on the transfer case. The servo controls an actuator under the battery which sends vac to the front axle. The transfer case and front axle servo work together.

Jun 30, 2013 | Cars & Trucks

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Can't find where to install transfer case switch on 1991 chevy s10 my truck will not shift into 4 high. part store sold me a transfer case switch but i can't find it on my truck. can anyone tell me where...


i'm sorry to say you dont have one only the newer models do you should just have a lever like i do and if it switch into 4 high and it still wont engage see if there is a light on for the front axel by the lever it should glow bright orange if not your front drive shaft is not engageing and that a vaccum switch under your battery not electronic at all you can get a manual cable one from lmctrucks.com or you can custom make one your self

Jan 10, 2010 | 1991 Chevrolet S-10 Blazer

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1998 Chevy S10 front axle will not engage when put into 4 wheel


Normal thing that happens as long as onone (worked) on it, is the vacume hose going to the engage sevevo under the battery box has fell of on either end or is brocken on the way there. Then the once or now leaky battery acid ate up this same servo. then the cable going to the front axel breaks sticks falls off or even someone needing one climbed under your truck while parked somewhere to get one to replace their brokeen one now you don't have one then theaxel engage arm or gearset is damaged

Aug 16, 2009 | 1998 Chevrolet S-10 Pickup

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98 Chevy S10 4wd drive will not engage when button is pushed


your problem sounds like either the transfer case control module located where you hear the clicking sound, or the actuator on the transfer case itself.

try unplugging the transfer case control module and then plug it back in, try engaging 4wd again (make sure your in neutral, coasting at 1-2 mph might help as well) if it still doesn't work check the actuator itself to see if the actuator is trying to engage. if the actuator is trying to engage but doesn't, take the actuator out and check it for wear or damage. if the actuator seems fine and it responds to the buttons when pressed i'd go after the transfer case control module as the culprit. ran into that a few times on those s-10's. 3 out of 4 that i've seen were fixed with a new tccm. 1 of the 4 needed an actuator, check your local junk yard for a working tccm or actuator.

hope this helps!

Feb 17, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

1991 Chevy S10 Automatic-4WD will not engage


it is on the top left hand side hould feel three vacuum hose plugging into it

Jan 15, 2009 | 1991 Chevrolet S-10

1 Answer

Chevy s10 4 wheel drive will not engage


There is a vaccuum operated switch located on the transfer case that sends vaccum to the accuator that pulls a cable that locks the front end in. Check for vac coming in and out of this switch if no vac out replace it. This switch is a very common problem. You can find them at most parts stores in the help section #49315. please rate.

Dec 08, 2008 | 1991 Chevrolet S-10

1 Answer

4x4 on a 2001 s10


when the transfer case shifts into 4wd it activates a vaccum switch on the transfer case which sends vaccum to the accuator for the front axle. the accuator pulls a cable that locks in the axle. the switch on the transfer case is a well known problem. check for vaccum in and out of this switch in 4wd. if you have vaccum out then check the accuator under the battery. If the vaccum switch on the transfer case is bad you can find one at most parts store in the HELP section #49315. please rate if this helps

Nov 22, 2008 | 2001 Chevrolet S-10

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