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The A/C compressor suddenly stopped operating. Refrigerant levels and pressures okay. Blower works in all speeds when manually selected. Blower does not automatically come on at Low speed with A/C selected (it should according to the manual). When compressor hot wired directly to alternator output, the compressor operates normally. Heater and blower fuses are okay. I sprayed electrical contact cleaner on the "S2" switch. The best I can tell, the S2 switch allows power to both the blower and compressor when the A/C mode is selected to Max A/C. The only thing left is the Thermal switch (which I did not check), but this switch in warm climates is normally closed. A closed thermal switch completes the circuit to the compressor. The compressor ground is good. The only thing left is maybe a broken wire???
I have been using the Corvette Four Season Wiring Diagram on pg 1A-71 for reference out of the Chassis Service Manual.
Does anyone have any other toubleshooting suggestions?
Jump the thermal switch to test it. Use a test light on the S1 and S2 switches.
Mel,
I cannot reach the thermal switch. However, if I could run a continuity test between the DG compressor wire and the tan wire at S2, wouldn't that test suffice for a closed thermal switch? Then perhaps my problem circuit would be between terminal 6 of the fan switch (gray wire) and S2???
A/C Compressor Problem
