Question about 1999 Chevrolet Blazer

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1998 Chevy Blazer Blowing Hot Air and Compressor Not Engaging

My 1998 Chevy Blazer is blowing hot air with the compressor not engaging when I turn on the A/C. A similar thing happened about 2 years ago, but the compressor was turning on and off while now it never switches on (fixed that with a refrigerant recharge). I checked my refrigerant level this time and it appears to be filled up to the correct level (estimated using the color coded gauge on a R-134a refill can so probably not very precise).

While the compressor does not engage automatically I was able to trigger it by crossing the input switch (don't know the correct name) that goes into the compressor using a paper clip. After crossing the wires on this switch the compressor purrs like a kitten. However after running the compressor for a couple minutes I did not notice any change in the A/C temp.

I am a bit of a novice so I am not quite sure if this is a bad compressor, bad pressure switch, a simple overfill or something else. Any help would be appreciated as I would love to fix this thing myself and save some of the little money I make!


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  • captmorg79 Jun 19, 2009

    Thought I would add just a little more about this problem:

    When this happend two years ago the color coded gauge on my store bought R-134a refill kit confirmed that I was low on R-134a (so I topped it off and everything worked great). This time the gauge say that I have plenty of refrigerant. Could this be a false reading due to air in compressor? I don't want to add more R-134a and overfill the compressor. Also should the compressor be running when I check the pressure level and add refridgerant?

    Thanks 6bta and others!

    I am warry about trying to add more R-134a myself as I



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You would be low on 134a. To put refegerant in an a/c system you need to pull a vaccume on the system. Any air in there it will not work. It would be worth the money to have some one do it. But I'd look at the compressor case halfs and see if they are leaking before having it charged. You could fix that yourself and pay some one to charge it, if they are leaking.

Posted on Jun 19, 2009


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