Alright everybody I have a trouble shooting issue and want some help. I had an ac issue where I would turn on the ac and the fuse would blow( I believe it’s called f32?). I unplugged the compressor and found that the fuse wouldn’t blow anymore. So I thought the compressor was the issue.

Bought a new ac compressor and installed it. Fuse doesn’t blow anymore…. But, Now I found that the clutch does not engage. Okay….. started checking the wiring diagrams. Checked every single fuse no matter if it was related to the ac or not they are all good. Checked the relay it is good. I did have a code for the solar sensor so I went to the junkyard and got another and that didnt fix the issue. Replaced the AC pressure valve, still no fix. Based on the wiring diagram the only other thing was leading to the Climate control module. Got one from a junkyard and installed it, same thing.

Initially what I thought was just an a/c compressor, has turned into me having to check through the whole system.

checked the three evaporator temperature sensors. All read around the same resistance.

When jumping at the relay the compressor does engage.


I am lost and am wondering if anyone has any other ideas or things I possibly missed that would affect the a/c compressor clutch not engaging? Could it be a mechanical issue and not something electrical like I am thinking?

 

Welcome to the forum.

Have you read through the climate control troubleshooting guide? Specifically, please see post #5:

https://www.jaguarforums.com/forum/s...2/#post1714574

Don't get sidetracked chasing faults in the automatic control system. On the control panel, hold the temperature down button until LO is displayed. This is a manual mode that bypasses most of the automatic features. You mentioned replacing the solar sensor, but that will have zero effect on whether the clutch engages. Use manual LO for troubleshooting, at least for now.

You mentioned the clutch will engage when the relay is jumpered, so that is a good sign.
Have you tried swapping the relay, even though you said it was good?

I'm not fond of loading the parts catapult (Pull!) in hopes of a fix. But if I had to gamble with your time and hard-earned money, I'd consider the AC pressure sensor. If bad, it could inhibit the command to engage the clutch. Details of this sensor at the link above. Replacement is easy. There's a little valve that closes automatically when the sensor is removed, so refrigerant loss is minimal.

After replacing the compressor, did you do the full vacuum and refill? Or are you hitting a roadblock, trying to get the compressor to run as part of the refill procedure? If the latter, the AC pressure sensor will not let the compressor run on an empty system. You have to put at least half a can or so before the compressor will run. Many other vehicles do not have such protection, so the refill procedure may be different than what you're familiar with.

 

Another idea you can try. This will require a helper:

At the front power distribution box, place your finger on the compressor clutch relay. Have a helper start the engine. Select manual LO. Cycle the AC switch on and off every few seconds. You should feel the relay click each time.

If so, the control system is sending the command to energize the relay. This does not guarantee the contacts within the relay are closing properly to send power to the clutch. But it does confirm the relay is receiving the command.

If no click, swap with a known-good relay. If still no click, the command is not being sent and that is where you'll have to concentrate your efforts.

 

Thank you for the response and the insight!! Will give everything you mentioned a try and then reply back!