I am having problems with my 2000 Chevrolet Silverado Pickup (5.3 v8) air conditioner. The compressor works fine and blows good, cool air for the first five minutes after the engine is started; then, when the compressor disengages, it will not reengage and then blows hot air. Meanwhile, the refrigerant level checks fine. Also, whenever you restart the engine after it sits for about five minutes, it works fine and blows good, cool air again for about five more minutes, then quits blowing cool air again. Could my problem be the air compressor clutch or is it some type of relay switch?
Thanks so much for your time and support.
It can be a lot of things, electrical or pressure related.
How do you know the system is fully charged?
From your description it could be a low state of charge, or another condition causing excessively low pressure on the low-side of the system. Cooling OK on start-up followed by the compressor clutch disengaging is a typical symptom.
When the compressor is off (engine running, A/C on, not cooling) disconnect the low pressure switch at the accumulator and jump the 2 terminals on the connector side. If the compressor comes on, it could be a bad switch, low refrigerant, clogged orifice tube, and the list goes on. Pressure testing would be the next step.