I got voltage across the low pressure switch. The evaporator temp sensor is still a pain to get at. I did not get any voltage across the temp sensor at the drier when the car is running. But when I jump the compressor, the aux fan does come on. I am not sure that if the engine temp sensor is activating this or the drier temp sensor. I bypassed the temp sensor at the drier, still no AC.

How do I check the evaporator temp sensor exactly? Is there voltage when the PBU is engaged and no voltage when PBU is not? How many volts?

Thanks,

John