Chris ... 5/14/2010
2003 GMC Sierra 1500 HD SLE 8 Cyl 6.0L
Cools at first, then after a few minutes, compressior will not come on.
When truck is cold, air comes on just fine with a/c on manual or auto. After awhile, the compressior cuts off and in most instances, it will not come back on. It's as if the internal temp is telling the a/c computer that the temp is as low as you set it to. On the other hand, even when it's on manual after it's wormed up, it still will not kick in the compressior to come on. If it was low on gas, it wouldn't cool at all. I don't know where to start.
Mitch Boutte 5/14/2010
AC compressor clutch may be failing , first check for loose wire, or fan belts, you may need coolant or possibly you may need to have the whole system purged of moisture then re charged , but make sure the clutch on the end of the compressor is not the problem check the belts and wires first.