Question about 1996 Chevrolet Blazer

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Vacuum leak I have a 1996 chevrolet blazer s10. When i try to change the heater control switch from floor to vent or anyother position most if not all the air comes out of the defrost vent. Some say it is a leak behind the dash the other say it is a leak up by the motor. Any help would be appreciated.

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  • Anonymous Jun 12, 2008

    VENTS TO DASH DOES NOT WORK ALL AIR COMES OUT ON FLOOR OR DEFROST.

  • bigler Nov 20, 2008

    I have a 97 Chevy blazer, 4 wheel drive with a 4.3. I was having aproblem with the vents, they would randomly select and changethemselves from what was selected. As well While driving, when theblower is on in any mode... it started clicking and clinking from timeto time like a solenoid was going out or something. Tonight I tried the heat/defrost... it blew... but no heat now.
    Themotor and everything are like new and all the ac underhood is new andgreat... this clunking is new though... from about 2 months.
    Any help on this matter or how to fix it would be appreciated, thank you in advance.
    Iknow this might be a vacuum advance or some other switching issue... soplease point me towards where to look / what to replace.
    Thanks, -Steve
    Feel free to write me directly as well:
    bigler.steve@gmail.com

  • dusty91 Jan 05, 2009

    I am having the same problem with the AC and getting it into 4 wheel drive. Where do you think the vacuum leak is?

  • kosrae71 May 11, 2010

    i have a 96 chevy blazer. how do i take the dash off in order to put a new stereo in.

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I have a 1992 chevy blazer s-10 type my heater blowes through the defrost and floor will not blow through vents on dash can you please help with problem thank you frank

Posted on Dec 14, 2009

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

Posted on May 25, 2008

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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

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Your air leak is in the heater control switch. You have to replace this unit. I have done this in both S10 Blazer and S15 GMC. Remove the front dash cover and remove the control bolts. One control is electric and the other is air controled. You can get this unit from GM or take your chance and buy it from the wrecking yard or off EBay.

Now some one also posted that there 4X4 is not working also. This uint is controled by electronic control. The transfer case has a electric motor on it and is control by the switch on the dash only. There is a canister outside under the front right (pass) side fender that controls the locking gear for the front drive axel Chech this for air leaks.

Now for the banging in the heater unit. It is the blower motor. I have the same problem right now in my S15. It needs to be changed.

Posted on Jan 13, 2009

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