I have an issue with my a/c system. When using just the fan with the a/c button in the cab in the off position, I can hear the compressor turning on and off and noticed condensation dripping from the accumulator/dryer. I noticed this when driving to the store and seeing the puddle under my truck. It was not in the defrost position which I have heard causes the compressor to kick on. I have checked fuses and relays and they seem to be good. Any ideas on this would be appreciated.

SOURCE: Air conditioning not working

it more than likely needs to be recharged when it low on feron it won't run so you don't damage the compressor

SOURCE: Ac compressor won't kick on

Just had the same issue and posted. Just found the solution is the control module in the dash. Went to the junk yard since new is expensive on these units. Plugged new unit in, was able to charge a/c now blows cold as ice.

Harvey N Tawatao

• 3854 Answers
• Posted on Jun 23, 2009

SOURCE: 1995 z-28. air conditioner compressor won't kick

Your A/C pressure switch may have gone bad or the wire harness to it may have gone bad. The switch is along the low pressure line or on the A/C Accumulator ( looks like a silver canister) , Unplug the wire and you can jump it there and see if the clutch comes on, if it does try spreading the two tabs apart on the switch and clipping the wire back on. If it does not come back on you need to replace the switch, you can do it with out loosing to much R134A. Just got to be quick when you  remove the old one and placing the new one. The low side should have a reading of 30PSI to 50PSI and the high side should have 150PSI to 200PSI. Any other reading will give you poor A/C performance. Good luck and hope this helps.

SOURCE: 2004 Impala rear window defroster not working

the 30 amp breaker is behind the fuses ....u have to take the glovecompartment out and pull the whole fusebox out if ur hands r too big ....the power seat circuit breaker is there 2
nab

SOURCE: Air conditioning compressor not getting power on 96 Chevy Tahoe

Freon is what you are missing, our more specificly a refigerant charge that exceeds 45psi on the low side pressure line. This system has two pressure switches, a high side cut-out switch mounted on the rear of the compressor, and a low side or pressure cycling switch on the suction line.
Jump the low side switch contacts to ensure the electronics are sound for this system. If the compressor cycles, you know the system is low on a refrigerant charge. Turning on the AC is a request, and certain criteria must be met before the system operates as designed. Good luck