Question about 1996 Chevrolet Blazer

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Have a 1996 chevy blazer , my heat comes out the defrost and foot vents and wont switch to one or the other . i can hear vacuum noises behind the selector knob.

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  • roger
    roger Jan 04, 2014

    same problem on 3 of my plow trucks. if you look up by the right side of your gas peddle you will see where the springs from the motor hooks to a lever that runs the flapper.the other end of the flapper fell out of its hole. you can put it back in but what holds it there i have no idea. but manually you can turn it on what setting you want. im going to do some more research on this to find out if that is an easy fix because its no fun taking the dash out

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  • 2 Answers

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Posted on Jan 02, 2017

  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

  • 1 Answer

SOURCE: vacuum leak

Hey there. I've got a 96' blazer and this happened to me as well. Turned out that I was getting the 4 wheel drive checked out because it wasn't engaging and they found that a vacuum hose was loose. The mechanic said that when it is a vacuum hose, the blower won't engage correctly to the desired setting... usually just blows out the defrost. Hope that helps.

Ben

Posted on Dec 27, 2008

  • 1 Answer

SOURCE: 1996 chevy truck A/C, Heater and defrost not

Could be the blower motor, I have had and am continuing to have the same problem. Replacing the motor did help though.

Posted on May 15, 2009

alenjogy
  • 123 Answers

SOURCE: i am looking for a vacuum diagram for a 1996 chevy

go to a near by workshop

Posted on Jul 18, 2009

  • 89 Answers

SOURCE: front windshield defroster on my 96 chevy truck doesnt work

defrost dorr is not opening check to see if cable clamp has broken or if works off vaccum check for broken vacum line. berrydalewolfe

Posted on Oct 29, 2009

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1 Answer

2003 chevy blazer heat won't blow on floor


Transfer case switch may be bad allowing trans fluid in vac. Lines and can reach as far as heater switch common problem fix these all the time 17 bucks for tranfer case switch and 20 foot of vacume hose and replace all the vac. Hose because this issue causes pcv to not work correctly so the moisture from crank case ends up going out the distributor vents causing cap and rotor corrosion there is service bulletin to remove distributor vent screens i would fix that since you will be working next to it any way

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Open your hood. You should see a ball attached to it, (just in front of the driver side). There are vacuum lines connected to a ball reservoir. Replace them. Mine were turning into dust. I had the same problem and fixing the vacuum lines corrected it. This is for a 1996 Bravada. Blazer's have the same vacuum lines, but the reservoir is not there.

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I have a 96 chevy s-10 blazer. the heat works but only out the defrost. Im not sure about the air or not, the switch has to be on vent to try it but since no matter what i put the switch on it always comes...


there is an accuator on the evap box which controls this movement now it can be this or the control assy has gone bad you will probably have to see a mechanic to have this repaired

Feb 19, 2011 | 1996 Chevrolet Blazer

1 Answer

When heat or air is on, with the control switch turned to "floor" it still comes out defrost vents. does not come out from floor. 2001 chevy s-10 blazer. 2 wheel drive v-6. 4 door.


most common problem with that is vacuume leaks. usually the rubber hoses up by the driver side fender by the brake booster.they get dryrotted and crumble

Jan 08, 2011 | 2001 Chevrolet Blazer

1 Answer

97 Lumina...Switch stuck on defrost vent and


I had same problem . There is a vacuum resovoir tank located behind the left front splash shield . The vacuum line behind the battery goes to it . I removed two 5/32 screws just in front of the tire that hold the splash shield to the fender , carefully flex the shield away from the fender and take a look . I found the vacuum line had come loose , plugged it back on and everything works . Hope this helps

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1996 chevy blazer my air on heater will not blow


the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up

Sep 08, 2009 | 1996 Chevrolet Blazer

1 Answer

2003 Blazer - Oil coming from climate control vacuum connector


May sound silly but take a short length of hose and put one end to your ear and use the other end to probe for the leak. It will be substantially louder as you get nearer to it. As far as the oily stuff in the lines, I can't think of anywhere it could be coming from unless the master cylinder is leaking into the power booster and somehow getting into vacuum lines...but this should not happen because any fluid in there would be drawn into the engine, and, the master would be low??? Try to find the leak first and deal with the other thing later...it may turn out to be a "nothing" item.

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4 Answers

Vacuum leak


i would say its in the dash unfortunately you will have to pull it out to inspect.

May 25, 2008 | 1996 Chevrolet Blazer

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