AC clutch won't engage

[DenT]

With summer around the corner i'm hopin to work this out. if i short the wire the clutch will engage but not thru the heater control system... i used to have a leak which i pinpointed and fixed. any suggestions?

[Bronco]

My compressor was cutting in and out and I replaced the positive battery cable that was corroded and it has never done it again. Something to check. You could put a voltage tester in the wire that goes over the top of the compressor the check the voltage. There is a pull apart connection that you could use to get into the line just behind the compressor. If you don’t get good voltage it won’t work.

[satan]

While you indicate that you "used to have a leak which i pinpointed and fixed", have you verified the state of charge in your system?

A first step would be to ensure that your system has adequate charge, then to verify the operation of the pressure switch (on the dryer) -- you can short across the switch to see if the A/C Clutch engages when called by the controls...

If the clutch does engage with the swith bypassed, then suspect either a failed switch or a dischagred system....

[bbaker80]

You could always pull out everything but the compressor and work on an OBA setup:D . I have to agree that either the switch is bad or the system isn't holding a charge (that's why mine is now OBA). Have you converted it to R134-A? Does it blow cold when you do directly connect it to the battery?