AC runs constantly...
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From: Camden De
AC runs constantly...
Hello all! I've got a 1992 LT1 with the auto. climate control and regardless of what I do, my ac compressor continues to run. Has anyone seen this before and what would the cure be. I'm not to keen on putting an inline switch to cut power to the compressor. Thanks!!!!
Paul
Paul
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From: San Diego, Ca
Compressor is powered up by a relay which is driven (grounded) by the PCM. I'd find the relay and replace it. Otherwise, you need to trouble shoot it's wiring - short to ground on the PCM side.
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From: Camden De
Originally Posted by SunCr
Compressor is powered up by a relay which is driven (grounded) by the PCM. I'd find the relay and replace it. Otherwise, you need to trouble shoot it's wiring - short to ground on the PCM side.
Thanks! I'll look into that!
P.
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From: Camden De
Originally Posted by aminnich
Is you enigne fan also running constantly?
Yes, it is running constantly. Even at the highest temp setting (with defrost off), the fan and compressor are going like crazy!
P.
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From: Camden De
Originally Posted by Drug Delivery
I have the same problem. I can only get heat when I adjust the temperature to 90 degrees. Being summer here now, I'm just dealing with it.
P.
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Drug Delivery - think you have a different problem. System delivers air to a/c vents or floor depending on temp selected and signals from two thermistors - inside temp or sun load and the outside temp sensors. If its particularly hot inside the car, you may only get a/c until 90. 90 and 60 overrides the sensor signals and will always push air through the a/c vents (60) or heater (90). A real crap shoot to troubleshoot anything in between as there are no published parameters for where the vents should be based on the sensor signals. Most just try new sensors to see what happens. Otherwise, the Processor for all of this is the Programmer. Whatever you select at the Dash is sent over a serial data line and the Programmer does it's thing based on that selection and the sensor(s) input. You can only troubleshoot the data line with a scanner - voltages are meaningless. A lot of problems do end up being the Programmer, but it depends on specific symptoms.
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Can you perform these steps and where do you fail?
Turn the key to on, press off on the climate control, start the engine.
Is the drivers fan on
Is the compressor turning
Is the compressor cycling on and off
Turn A/C on to recurc, fan and compressor should come on and compressor should start to cycle in about 30 sec to minute approx.
Can you turn A/C off, is it indicated on climate control and does the fan and compressor stop?
The compressor runs in 3 A/C positions, when placed back to off, fan will run for some time and then shut down.
Turn the key to on, press off on the climate control, start the engine.
Is the drivers fan on
Is the compressor turning
Is the compressor cycling on and off
Turn A/C on to recurc, fan and compressor should come on and compressor should start to cycle in about 30 sec to minute approx.
Can you turn A/C off, is it indicated on climate control and does the fan and compressor stop?
The compressor runs in 3 A/C positions, when placed back to off, fan will run for some time and then shut down.
