So in the last couple months I've had this happen 3 separate times. I'm using the AC, and all of a sudden the idle climbs because the compressor clutch disengages.
The first time I was sitting in a parking lot idling while on lunch. AC was on, at normal high idle, then the clutch disengaged and the idle climbed to 1500+ RPM. Turning off the AC brought the idle back down, and turning it back on did not restart the compressor. I turned it off and went inside.
The second time I was driving, and noticed the air getting warm. I turned the AC off and then back on a few minutes later, and it worked fine the rest of the day.
Then today, I was sitting at a light, turned left, and then stopped to prepare for another turn and noticed the idle didn't come back down, and sure enough, warm air from the vents. Cycling the button turned it back on for a few seconds, and then it did it again.
The majority of the time it works pretty well.
It seems to me that the compressor clutch is disengaging but the ECU still thinks it's on, so it maintains high idle but without the compressor load it idles way high. I'm thinking it may be a failing relay, or maybe the compressor is overheating and turning off? Do our compressors have thermo switches? And would it just disengage the clutch, or would it tell the ECU to turn off the AC?
The car is an '01 LS. If you have any other questions ask away.
Thanks in advance!
-Chandler
The first time I was sitting in a parking lot idling while on lunch. AC was on, at normal high idle, then the clutch disengaged and the idle climbed to 1500+ RPM. Turning off the AC brought the idle back down, and turning it back on did not restart the compressor. I turned it off and went inside.
The second time I was driving, and noticed the air getting warm. I turned the AC off and then back on a few minutes later, and it worked fine the rest of the day.
Then today, I was sitting at a light, turned left, and then stopped to prepare for another turn and noticed the idle didn't come back down, and sure enough, warm air from the vents. Cycling the button turned it back on for a few seconds, and then it did it again.
The majority of the time it works pretty well.
It seems to me that the compressor clutch is disengaging but the ECU still thinks it's on, so it maintains high idle but without the compressor load it idles way high. I'm thinking it may be a failing relay, or maybe the compressor is overheating and turning off? Do our compressors have thermo switches? And would it just disengage the clutch, or would it tell the ECU to turn off the AC?
The car is an '01 LS. If you have any other questions ask away.
Thanks in advance!
-Chandler
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