A/C compressor not turning on
05-17-2014, 11:22 PM
#16
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I gave up and jumpered power from the cold side of the fuse to the a/c relay. A/c will always be on, but still goes through the low pressure switch and through the relay so the DME can shut off the a/c if it wants to. I just can't control the compressor with the switch. Now I have to wait for it to warm up to make sure the whole system works as it was too cold for the CC unit to give me cold air (upper 50's outside).
08-03-2024, 08:20 PM
#17
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Same problem
Does anyone know exactly what the freeze protection switch looks like? I think I have it narrowed down to that as the a/c switch works (I tested the resistance open and closed and it read properly, plus it's turning on one of the hvac box vacuum solenoids when depressed). There's just no power getting to the relay. I tried jumping positive power from the battery through pin 87a on the relay which leads to the low pressure switch and then the compressor and bam, nice cold a/c and the compressor stayed on, so it's definitely not the pressure switch or compressor or the wiring from the fuse box to the compressor.
I'm going to check the output of the climate control unit and make sure voltage is getting out of it, then I'm going to hunt down the freeze protection switch as my guess is that's either bad or disconnected.
I'm going to check the output of the climate control unit and make sure voltage is getting out of it, then I'm going to hunt down the freeze protection switch as my guess is that's either bad or disconnected.