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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Posted on Jan 02, 2017

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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.


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

  • 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

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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

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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.

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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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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 may turn out to be a "nothing" item.

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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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