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Question
98GreenZ
Greetings all....first time post for me, and of course, I have a problem.
All of a sudden yesterday, no air conditioning. Compressor clutch won't engage.
Vehicle: 1998 Chev. Z71 p/u
So far, I have determined the following:
1. A/C clutch relay is good (at the VCM, short pin 1 of connector C3 to ground, relay energizes & compressor clutch engages).
2. High-pressure switch is good (pin 25 of same connector shows 12v from A/C request switch).
3. Low-pressure/Cycling switch is good (switch is not shorting A/C cycling signal from VCM to ground).
From the above checks, it tells me that all the proper signals are being sent to the VCM, but it's not pulling pin 1 to ground, which would enable the clutch relay. Does this sound right?
If it does turn out to be a bad VCM, what's the best way to have it replaced? Dealer? A/C shop? DIY? (Although I wouldn't be able to program it if needed.)
Thanks in advance,
Mike
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