Check the owners manual.
https://www.manualslib.com/
SOURCE: 2004 gmc sierra 5.3. AC not working AC Compressor fuse blowing
UNPLUG THE A/C CONNETOR ON THE A/C COMMPRESOR. REPLACE THE FUSE AND TURN ON THE SWITCH. FUSE OK . REPLACE THE COMMPRESSOR AND THE RECIVER DRIER.
SOURCE: No power for AC compressor
It sounds like you may be low on freon, if the low pressure switch, senses low freon pressure, it won't let the A/C come on. You either have low freon, or the low pressure switch on the accumulator has gone bad. Both common problems with that vehicle.
SOURCE: can some post the 1999 gmc sierra wiring diagram
you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.
SOURCE: AC Compressor not engaging on 2000 Chevy Impala.
When your R-134a runs too low it will NOT engage the compressor. You need to refill your a/c system before the clutch will engage, I also suggest finding the leak.
SOURCE: have no power to the ac compressor. all fuses and
SOUND LIKE AC COMPRESSOR CLUTCH COIL IS OPEN.ITS GETTING POWER YOU HAVE A OPEN COIL CIRCUIT.
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