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04-15-2009, 07:56 AM #1
- Join Date
- Aug 2005
- Location
- Weston, FL
- Age
- 60
- Posts
- 14
white- 1998 Camaro Z28
A/C Compressor won't disengage in time
Ever since my 1998 LS1 was rebuilt (after breaking valve spring) the a/c compressor does not disengage at WOT (or does not disengage fast enough). I'm now on my third compressor because it gets over-driven and destroyed at high rpm. Only significant differences in engine after rebuild is GM ls1 hot cam, machined deck, and aftermarket valve springs.
Is compressor disengage controlled by pcm or maybe some separate relay? Can this be fixed by programming? If so, I'm going in for tuning after current installation of new headers, intake manifold and throttle body so I could get it done then. Thanks!!
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04-15-2009, 04:24 PM #2
I know how to fix the problem.
STOP GOING WOT WITH THE A/C ON! Didn't anyone ever tell you that this is bad for it? The compressor certainly cannot disengage fast enough. You keep tearing them up.Last edited by 9t8z28; 04-15-2009 at 04:33 PM.
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04-16-2009, 05:13 AM #3
- Join Date
- Aug 2005
- Location
- Weston, FL
- Age
- 60
- Posts
- 14
white- 1998 Camaro Z28
Um yeah, thanks for that... Actually, Chevy thought about that and made provisions for the a/c clutch to disengage at wot so rocket scientists like you and me wouldn't have to worry about it. I'm just wondering why mine no longer functions like it used to and how to fix it.
I already have a home-made disconnect switch installed that is actuated by the throttle lever to shut off the a/c at wot, but am trying to find a more "correct" way to do this...
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04-16-2009, 08:31 AM #4
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04-16-2009, 12:06 PM #5
- Join Date
- Aug 2005
- Location
- Weston, FL
- Age
- 60
- Posts
- 14
white- 1998 Camaro Z28
Ok, thanks. Do you know if the a/c clutch is disengaged by a signal from the PCM (based on throttle position) or is there a separate relay somewhere?
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04-16-2009, 12:48 PM #6
- Join Date
- Aug 2005
- Location
- Weston, FL
- Age
- 60
- Posts
- 14
white- 1998 Camaro Z28
Found answer. There is an a/c compressor clutch relay located in the underhood fuse block that is controlled by the PCM. One of the inputs to the PCM that controls the relay is TPS signal (others are a/c request signal and refrigerant pressure sensor signal). I'll check relay.
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07-05-2009, 08:24 PM #7
- Join Date
- Oct 2007
- Location
- Beaver Dam KY
- Posts
- 7,745
79 T/A -91 Firebird- 1998 Trans Am -Oynx Black
Well since im on this topic in chat Ill post up that the 98 PCM has a lag in WOT clutch disengagement
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07-06-2009, 07:00 AM #8
- Join Date
- Aug 2005
- Location
- Weston, FL
- Age
- 60
- Posts
- 14
white- 1998 Camaro Z28
Thanks very much for the info. I resolved the problem with programming via HP Tuners and it's working fine so far!
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07-06-2009, 08:45 AM #9
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