1998 Chevy K1500, 5.7L Vortec. I went to start it this week for the first time in 2-3 weeks and the AC doesn't work at all. The push button switch on the dash lights up but checking under the hood the compressor clutch isn't engaged. I changed the 10A AC fuse and swapped the relay with another identical one that happened to be the starter relay. The truck still started but no AC, so my first assumption is that this proves the AC relay is still good, since it wouldn't have started if it were bad. OK so far? My second assumption is that the starter relay should have fixed the AC if it were a relay problem. Right?
Next I disconnected the wires to the compressor and tested them with a voltmeter. With the AC switched on it had 0V to the compressor clutch. Based on this my conclusion is that the problem is likely the AC switch in the dash or a wiring issue somewhere between. What else might I be missing?
Next I disconnected the wires to the compressor and tested them with a voltmeter. With the AC switched on it had 0V to the compressor clutch. Based on this my conclusion is that the problem is likely the AC switch in the dash or a wiring issue somewhere between. What else might I be missing?