[Brian D]

I have a 1996 LHS and am having problems with my AC. I've replaced the condenser, compressor, expansion valve, and receiver dryer. After a few days of frustration because I couldn't get the system to take a Freon charge, I discovered that I don't have power to the compressor. I can apply power using a jumper wire and get the system charged and operating, but when I reconnect everything, I don't have power to the compressor. I was told that there is some sort of "control" box in place that functions as the low pressure switch, but I haven't located it.
Has anyone else encountered this problem?
How was it corrected?
All help is appreciated.

 

[ImperialCrown]

There is a refrigerant pressure transducer (sensor) in the hi-side line. It has a 3-wire connector and runs on 5 volts. It may or may not set a fault code depending on its mode of failure. It gives hi side pressure information to the PCM which will turn the compressor relay on or off.
There is also an evaporator temp sensor probe failure that can tell the PCM that the evap is in danger of freezing that will also keep the compressor off.
This may best be diagnosed with a scan tool. It does sound like an electrical issue instead of hardware.

 

[Brian D]

Thanks ImperialCrown,
That's pretty much what I learned today at my local Chrysler Dealer. I was able to borrow a 1996 service manual and the dealer also printed off a service bulletin from late 1995 that gave more information as to diagnostic procedures and parts replacement.
He also mentioned the temp probe as a possible cause but didn't have a replacement on hand.
Thanks for the help; hopefully I'll have cold air again soon.