Mechanics

CHEVY A/C NOT WORKING

2003 Chevrolet Tahoe

Air Conditioning problem
2003 Chevy Tahoe V8 Two Wheel Drive Automatic

I changed my alternator now my a/c is not working and the instrument lights for the a/c and rear defroster dont come on. What could be the problem?
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Onyx959702
August 24, 2009.



If your saying the ac blows air but it isn't cool, I'd have to check the compressor clutch, see if it is engaged. If it isn't engaged, I'd check the circuits at the ac relay, two of those terminals should be hot with key on. The pcm grounds the coil side of relay in order to energize. The pcm has to receive an ac request before it will energize the relay. If your low on refrigerant, the pcm may not receive a request.

JDL
Aug 24, 2009.