AC light on
Thread Starter
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
AC light on
My 01 with dual climate control has the AC light on even with 80 degrees set into the controls on a 50 degree day when it's in Auto. I also confirmed that the AC clutch is engaged when this occurs. The defrost is NOT selected either...when I turn the AC light off it kicks the climate control out of auto into manual operation...I read the owners manual front to back on the AC system and can't figure out why this is happening...any help out there anyone ??
Safety Car
Joined: Feb 2001
Posts: 3,725
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From: Warrington Pa.
It will do it and you Don't have a problem. The system puts the AC on even if it requires heat, as I said it removes the moisture ......you don't have a problem.
Melting Slicks
Joined: Jul 2013
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From: Anaheim CA
And looking at the schematics etc in the FSM, just because the button light is on doesn't mean the compressor clutch is engaged: that's controlled by a pressure switch as well as the control unit, with some additional inputs from the PCM.If the clutch is working (i.e. it disengages when you switch the A/C off manually), but it stays on all the time otherwise, you may be low on refrigerant and it's not getting to the high-pressure cutoff limit.
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Thread Starter
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Joined: Sep 2013
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From: Cape Coral, Florida
Thanks Bill,
Like I said it switches on and off (AC light on and off) when manual mode is selected and I verified this looking at the compressor clutch but always on in auto even if heat is selected I guess I'll check the refrigerant level !!
Like I said it switches on and off (AC light on and off) when manual mode is selected and I verified this looking at the compressor clutch but always on in auto even if heat is selected I guess I'll check the refrigerant level !!
Thread Starter
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Guessing from your remark I'd say you probably weren't even born yet or you were busy riding your Stingray.....with a banana seat...LOL !!!...my last GM product was a 1972 Z-28 Camaro... Enough said !!!
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At least now you know there is nothing wrong with your HVAC unit. 