Question about 1999 Chevrolet Blazer

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4 wheel drive on 1999 chevy blazer

Where is the vacuum switch located at on the transfer case and can it be changed without pulling the transfer case?

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  • michelle1281 Jan 07, 2009

    its a push button on the dash we pulled the vac hose off the accuator and there is no vacuum we bought a transfer case switch but can't seem to locate where it is on the transfer case

  • Anonymous Mar 19, 2014

    Can I use a 1993 4 wheel drive switch that is on top of the transfer case on a 1992 chevy truck. My truck is 92 and my friend has a harness and a switch off a 93 truck and I want to know if the harness will plug into the 4 wheel drive switch on top of the 92 transfer case. If the 93 harness wont plug into the 92 switch , can I use the harness pig-tail and the switch that came off the 93 together by screwing the switch into the transfer case and cutting/splicing the pigtail into my harness.

  • Anonymous Mar 20, 2014

    Where is the transfer case switch located on a 01. Chevy blazer

  • Anonymous Mar 30, 2014

    where is it located


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99 chev blazer should have an electric motor not a vac switch...Is your controll on the dash a switch you turn.. or on the floor you shift ??

Posted on Jan 07, 2009

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Pull the short shaft switch is on top of the transfer case you will see connector with 3 cacum lines going to it

Posted on Jul 22, 2012

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Changed to 4wheel drive low and I can't get it to change back to 2 wheel drive.

1999 Blazer. Thing's to check. 4x4 problem. There's an actuator pump under your battery plate. Make sure its in good shape and its working proper. Next check the cable that runs from the pump to the front transfer case. Then check the actuator switch on the front transfer case. Then check the vacuum lines from the front transfer case to the rear transfer case, that should be right under the drivers side door. There's also a actuator switch on the rear transfer case witch two vacuum lines run out of. Check them also, and last check your fluid level in your transfer case. Start from the beginning to the end. Don't forget to use your 4x4 every know and then to keep it up to power. Its not like the good old days. Where a pull of the lever on the floor engaged the 4x4. I hope this helps.

Apr 09, 2014 | 1999 Chevrolet Blazer

2 Answers

1997 chevy Blazer ZR2 4x4 not engaging

Fab only gave part of an answer. Check the vacuum lines on the driverside firewall. Also check your heater/AC unit make sure the air deflector will change from defrost to vent. If it stays on defrost no matter where you put the knob then you have a disconnected or leaking vacuum line to the dash. If that works and you don't see any open hoses then remove the battery and battery tray. You'll find the actuator there. Remove the vaccum line that goes to it, connect the battery or jumper cables so that you can start the engine. Put it in 4HI and feel for a vacuum at the line. If you do then put it on the actuator and see if it pulls on the cable. If there is no vacuum at that line then the switch at the transfer is bad and isn't sending vacuum to the actuator. If you do have vacuum and the cable didn't pull then change the actuator.

Mar 09, 2010 | 1997 Chevrolet Blazer

1 Answer

S10 blazer wont shift into 4 wheel drive and lights wont come on

I have an 84 s-10 blazer and had the exact same problem. As far as not going into four wheel drive, I would bet that all you need is a transfer case vacuum switch. All you have to do is get under you truck and look on top of the transfer case: you will see three vacuum lines that all connect to the transfer case case vacuum switch. Just pull off the vacuum hoses, unscrew the switch, screw in the new one and reconnect the vacuum lines. Thats it. Oh and you can get the transfer case vacuum switch from Advance Auto Parts for like $16 and some change. Now as far as the lights not coming on, it is most likely the four wheel drive indicator light switch. It just a plug that screws into the front axle. Just unplug the wires, unscrew the switch, screw in the new one and plug the wires back up. But make sure you check the bulbs in the floor console first. Good Luck and I hope this will help you.

Jan 25, 2010 | Chevrolet S 10 Cars & Trucks

2 Answers


My 4by4 doesn't engage,both lights 4hi and 4low blink for few seconds and then goes back to 2wd and that's it, won't engage 4wd...what should I do?

Jan 08, 2009 | 1999 Chevrolet Blazer

1 Answer

Where is the vacuum switch located at on the transfer case and can it be changed without pulling the transfer case? its a push button on the dash we pulled the vac hose off the accuator and there is no...

The switches are a very common problem on the S series. It screws into the top of the transfer case. The easiest way to reach it is going up next to the front drive shaft. There should be 3 vacuum lines going to it that attach in a single rubber plug onto the switch. Hope this helps.

Jan 08, 2009 | 1999 Chevrolet Blazer

1 Answer

My transfer case is permanently engaged but no 4 wheel drive...

2 common problems that cause this are the vacuum switch on the transfer case and the vacuum actuator mounted under the battery tray. When the switch on the transfer case goes bad it pulls fluid out of the transfer case and pumps it into the actuator and destroys it. The switch only costs about $15 and are usually stocked at major auto parts stores. The actuator ranges from about $50 to $120 and most of the time need to be ordered. If you reach under the battery tray with the 4wd engaged and follow the cable you will feel the end of the actuator, make sure that it is pulling back. If not either the switch or actuator or both are bad. Hope this helps.

Jan 08, 2009 | 1999 Chevrolet Blazer

2 Answers

1999 chev blazer 4x4 system

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.

Nov 23, 2008 | 1999 Chevrolet Blazer

1 Answer

Chevi blazer 1999 transmissioin shift problem


Aug 03, 2008 | 1999 Chevrolet Blazer

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2001 Chevy Blazer 4 wheel drive

The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.

Jun 02, 2008 | 2001 Chevrolet Blazer

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