AC compressor ghost running

[1997k1500Calvin]

Ok so I'm parked at the end of my driveway and no AC is on....the compressor is cutting on and off...Wtf

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[great white]

If you are in any of the defrost/defog selections, the compressor runs.

It is likely cycling because your refrigerant is low.

I never liked the automatic on feature of the AC with defrost, so I made it a manual selection: http://www.gmt400.com/forum/showthread.php?20385-How-to-disable-auto-AC-with-defog



That's for 96+ trucks....

 

[1997k1500Calvin]

Nothing was on... No defrost no vent..I'll check the freon when I can...I just put a new top line in and refilled with one tall can with a gauge on it..it read that it was full after the can..but is not ice cold like it should be

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[great white]

Then you've go some weird wiring thing going on because it shouldn't be on unless selected...

 

[Keepinitoldskool]

It will cut on if the high pressure switch detects a jump in headpressure. A restriction somewhere in your system can cause high headpressure, besides being over charged.

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[great white]

I'm no auto ac expert so I could be totally wrong, but I think the system has to be energized (ie: on) for high head pressure cycling.

Off should just be off.

I could be wrong though....

 

[1997k1500Calvin]

I'm no auto ac expert so I could be totally wrong, but I think the system has to be energized (ie: on) for high head pressure cycling.

Off should just be off.

I could be wrong though....

It makes a weird noise..like when you change the temperature the dash makes weird noises..then it ran..its been hot since it happened so I've had it on constantly so haven't checked of its still happening

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[Keepinitoldskool]

I'm no auto ac expert so I could be totally wrong, but I think the system has to be energized (ie: on) for high head pressure cycling.

Off should just be off.

I could be wrong though....

Actually high head pressure can happen without it being on. If the condensor gets heat soaked then the refrigerant inside it expands and creates high pressure. So the compressor will then kick on to relieve the head pressure and re compress the refrigerant. Thats my understanding of it anyways. I had a similar issue in my truck, turns out the clutch fan was failing.

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[1997k1500Calvin]

Actually high head pressure can happen without it being on. If the condensor gets heat soaked then the refrigerant inside it expands and creates high pressure. So the compressor will then kick on to relieve the head pressure and re compress the refrigerant. Thats my understanding of it anyways. I had a similar issue in my truck, turns out the clutch fan was failing.

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It seemed like it released pressure when it ran it "cycled" a couple times then I heard air releasing

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[1997k1500Calvin]

Ok turned off AC this morning running nothing, but windows down...at a stop light the compressor cycled and blew a small amount if cold air threw the vents...Wtf

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