Hello all and thank you for the warm welcome a few weeks back. I have been pretty busy working on the cat these past couple of weeks. Tires alignment, and the latest was a new update oil pressure switch. need to put new shocks in the back. My latest project is the a/c. It was working for about 2 weeks but starting leaking from the expansion valve. After replacement I started noticing the a/c temp would flucuate for 45 to 75 degrees while driving. I dye checked and found no leaks. One thing I did notice and am not sure if this is normal for the Jaguar but i suspect not is the a/c compressor does not kick on when turned on?? I checked the a/c clutch relay (tested across the terminals) and it clicks on.I suspect the compressor is cuting off of there is a switch controlling cycling.
Any ideas as to what could be causing this.
note: Both cooling fans are working.

 

Hi
When you replaced your expansion valve did you evacuate the freon in the systerm and then use a vacume pump to vacume out the system? usually for 30mins to 1 hour. Then after the valve replacment do it again for another 30 minutes and check to see if the system held a vacume?
When the system is opened to atmosphere moisture enters and MUST be removed or it can cause all kinds of problems.
Also usually when you open a system you usually replace the Filter/Drier as it can cause clogs in the system.

I'm not a AC expert but have been doing alot of research on the subject for my '89 XJ 40 AC problems.
Mike

 

Thanks for the response Mike.I am going to take it to the shop and have it evac, and vac tested

 

Yes, don't use your a/c untill it is properly evac and charged. Air in any refrigerated cooling system will spell quick death for the compressor and other parts.

So order a new filter dryer and then take it to the shop and have them install the dryer during their charge.

 

Yes, get the filter/drier, they are cheap.
Save yourself some money and purchase it yourself so you don't pay the shops , markup. New green O rings too.

 

Hello TSJAG,

I am sorry to hear about your a/c problems. I hope everything goes well with getting your a/c up and running. It seems these xj40's (mainly 93's,94's) just don't have good a/c systems. Next week i am having my new evaporator put in (finally) due to a really bad leak in the current evaporator.