2004 Sierra A/C problem

[Hazmat]

The AC has quit working. There is no power getting to the compressor. I have checked the fuses all good. Are there any switches or relays I might be missing.

Thanks

 

[dirtclod]

You'll have a low pressure switch. Trace the larger aluminum a/c line from the compressor, to the cab. Chances are the switch is working and stopping the compressor function. You have to connect a/c gauges to insure the system has enough refrigerant before assuming that the switch is bad.