95 ZJ with the manual temp controls. The A/C clutch wont engage when I turn the A/C on from the dash. The system has Freon in it. The fuses are all good and so is the relay. I am confident the high and low pressure switches are good too. If I jump the relay (30&87) the clutch engages and blows icy cold. While the relay is jumped if I disconnect either the high or low pressure switches the clutch will disengage like it should. It seems like I am not getting the ground signal from the PCM to the relay but I have no idea why. Anyone have any ideas?

 

I sent you a link (visitor message) to PDF service manual chapter 24 for Heat and A/C for 1995ZJ as well as 8W for wiring diagrams. There are some troubleshooting steps for A/C and test procedures that may be helpful.

I'm having a hard time finding what the forum rules are for sharing this sort of material, otherwise I'd make it public if I knew it was accepted.

Unfortunately I have not got around to troubleshooting the AC on either my 1995 (think she's got no charge) or my 1998 (suspecting low charge or bad pressure switch) yet - still got a list as long as my arm to complete on the Bullnose before I can get back to the Jeeps :S.