Hey all,
Got a problem I cannot figure out with my 03 Tahoe AC system...can't get power to the compressor clutch but I can get it to come on by jumping the relay. So far I have tested the relay and fuses and have tested/jumped the high and low pressure switches; this included testing the low pressure sensor wire at the HVAC controller which gets 4.6v when unplugged and 0v when jumped... as it should. I have swapped the actual HVAC controller with one I know works and still cannot get power to the AC clutch.
Long story short, with good refrigerant pressure, functioning pressure sensors, a working compressor clutch, and a good HVAC controller I cannot get a triggering signal at the relay. What is left? The wiring schematic I have suggests that it is the PCM that actually triggers the relay...is that right and if so how would I go about fixing it?
thanks guys!
Got a problem I cannot figure out with my 03 Tahoe AC system...can't get power to the compressor clutch but I can get it to come on by jumping the relay. So far I have tested the relay and fuses and have tested/jumped the high and low pressure switches; this included testing the low pressure sensor wire at the HVAC controller which gets 4.6v when unplugged and 0v when jumped... as it should. I have swapped the actual HVAC controller with one I know works and still cannot get power to the AC clutch.
Long story short, with good refrigerant pressure, functioning pressure sensors, a working compressor clutch, and a good HVAC controller I cannot get a triggering signal at the relay. What is left? The wiring schematic I have suggests that it is the PCM that actually triggers the relay...is that right and if so how would I go about fixing it?
thanks guys!