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1992 Chevrolet 1500 flasght AC light

FLBill on Sun November 04, 2007 7:43 AM User is offline

Year: 1992
Make: chevrolet
Model: 454 SS
Engine Size: 454
Refrigerant Type: R 12
Country of Origin: United States


I have a situation in which the AC light on the control head starts flashing after about three minuets of AC operration. It only occurs on cool days, that is, the system works great here in Florida, cooling down to 38 degrees at the registers on typical Florida days. The system works with out a hitch. I have noiced that only on cool days, like we are beginning to encounter here now, when the outside temp is like below 70 or so, does this condition occur. Being in Florida, I never turn the system off. By ten in the morning, typically, it is needed though. This all started in January of '07 when I had a ruptured manifold line replaced with the GM part. I also had R-12 reinstalled rather than doing the 134a conversion. My choice. I get the system back in order by disconnecting the battery. Any ideas for the cure??


GM Tech on Sun November 04, 2007 9:38 AM User is offline

you are getting the low refrigerant code- 91-92 C/K trucks did this- most likely you have lost enough refrigerant- the system is detecting rapid cycling and is shutting off the compressor to save the compressor- I would have it checked- look for leak around compressor shaft seal if low- then fix and recharge to specification- there is a service bulletin for this as well for false shut downs- do a forum search for 91-92 C/K trucks..................

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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