Hi Guys,

Ironically on Saturday I was thinking about just how wonderfully cool my A/C is in the Florida heat. We have been pretty hot and muggy the last week as the summer sauna finally turned on. Not more than 20 minutes later my world dramatically changed as my A/C started blowing warm air. I have tried messing around with all of the settings on the control panel and nothing is doing the trick.

Any idea what would cause such an acute lose of cooling? I have read that compressors seem to gradually go away so I do not think it is that. I have also read online that you should see the clutch spinning when the A/C is operating but what I think is the clutch is not moving.

Any help is greatly appreciated as it is so damn hot here and I am dreading the next few days without A/C as ironically my parents are in town using my backup car! Go figure...

Thanks!

Corey

 

I'm sure that if this was intermittent you'd have said so (ac is disabled as car approaches overheating temp). Have you had a chance to check the refrigerant level yet?

John

 

The Climate Control System has its own built in diagnostics.

Try following the instructions in this pdf file and see if you have any fault codes showing.

 

Awesome, thank you Derek. I will check for codes later this evening. Been doing a lot more digging on the forums and I am hopeful that it is the 4-way pressure switch. We shall see.

 

Hi John,

Thank you for your response. It has not been intermittent, it was blowing very cold and then just abruptly stopped. As for checking the refrigerant level, I am not sure how to do that. When I plugged in the A/C charging device it was on red area of the gauge which says to "see instructions." I was gathering from the instructions that he compressor was not running based upon not seeing the clutch turning. Is there a way to check the refrigerant level with another device and the compressor not running?

Thanks!

 

Information for operation of the 4 way pressure switch:

Pressure (Bitron) switch
Located in the discharge pipe.
Provides a signal, via the A/CCM, to the ECM, to disengage the compressor clutch should the refrigerant pressure be < 2 bar or > 30 bar.
Provides a hard-wired signal to the ECM, to switch the cooling fans to HIGH speed at 22 bar rising pressure and to LOW speed at 17,5 bar falling pressure.
Provides a hard-wired signal to the ECM, to switch the radiator cooling fans to LOW speed at 12 bar rising pressure and to switch the fans OFF at 8 bar falling pressure.

So a low refrigerant pressure will disconnect the clutch to protect the compressor. That should log a fault code.
There is a fuse (#8 10A) for the compressor clutch in the Engine Managment Fuse Box.
Adding refrigerant to the system, if the pressure is measuring low, will activate the clutch

 

Hey so I was able to pull the codes. Code 44 showed up, defrost vent motor fault harness / connector fault servo motor seized or sticking flap seized or sticking refer to pdu.

Do you think this is related to the AC going out or is this just another problem that existed before?

 

Hi Everyone,

Was able to get the AC running today. Stumpy was right on regarding the fuse. I crossed my fingers and pulled the #8 fuse and it was blown. Put a new one in and so far so good. I’m just hoping that whatever caused it to blow is a fluke and it doesn’t happen again. It makes a lot of sense that it was the fuse given the acuity of the failure and how well it was working immediately prior. So grateful it was a simple fix.

Thank you to the Jaguar Forums community once again!

Best,
Corey

 

Good new Corey!!! Congrats on the ez fix :-)

 

Hi Guys,

Thought I would check in with an update. The fuse has been blowing somewhat regularly as of late so there is something going on with the compressor. Been doing a bunch of research on this issue online and I feel like there is a good chance that the coil in the clutch could be shorting out. Has anyone repaired or replaced the coil and/or clutch or should you just replace the entire compressor? Also, before I did anything I wanted to make sure that was the correct diagnosis. Does anyone have any recommendations on what next steps to take?

Thanks!
Corey

 

Sorry to hear you are still having problems Corey.
First you could try disconnecting the clutch connector at the compressor and see if the fuse still blows, that would eliminate any wiring/loom problems.
Yes it is possible to replace just the clutch assembly, though you would have to check cost and availability in your area.

Edit - Quick search brought this up:
https://parts.jaguarpalmbeach.com/p/.../JLM20184.html