No A/C
No A/C
The wife came home and told me that the A/C is not working. I can see that the compressor is not engaging and I am unable to locate the fuse for it. I have no codes on the console and I do not have another relay. I am open for any input.
Veteran Member
Joined: Mar 2008
Posts: 5,390
Likes: 1,116
From: Ellijay
Beyond the fuse chart there is a pressure sensor in the AC system that will prevent the compressor clutch from engaging based on low static pressure. Best solution is to put a set of gauges on the high/low connectors and see what the situation is. Static pressure should be about 35 psi if my memory serves (a more and more infrequent occurrence).
Lots of AC sites that I spent a lot of time on with the last car. I think I have the Jaguar pressure charts based on ambient temperature (high, low, temperature) if you want to add to your web site.
Lots of AC sites that I spent a lot of time on with the last car. I think I have the Jaguar pressure charts based on ambient temperature (high, low, temperature) if you want to add to your web site.
Tom that would be fine. I have been working the yard and house and had little time to deal with it. I do not have a gauge to test. Last year I had to replace the evaporator coil it was full of cracks and leaks. I did pull the oneline today and saw the relay but was unable to locate the fuse I never once thought of the pressure switch. I see it now! Thanks! I think I will let the local shop check it out.
Veteran Member
Joined: Apr 2008
Posts: 3,472
Likes: 259
From: Atlanta, GA USA
Can you run a + bypass wire to the compressor and see if it engages. If not it may be a bad compressor clutch. If it does engage, check for proper cooling. Work your circuit back from the compressor.
Senior Member
Joined: Dec 2007
Posts: 162
Likes: 17
From: Central Texas
Fuse #8 10A Engine Management Fuse Box supplies 12V to the clutch via the relay.
This fuse supplies only the Comp. Clutch.
Fuse #14 10A same fuse box supplies the relay coil but it also supplies the Ign. Coil relay,
so it is ok since the car runs.
There is a 4 way pressure switch that feeds the AC module and the Engine Control Module
to tell when different pressures are reached.
From the 4 way pressure switch you should have 0V on the blue w/ black tracer wire
if you have at least 29 LBS (2 bar)
I have had my pressure switch fail.
This fuse supplies only the Comp. Clutch.
Fuse #14 10A same fuse box supplies the relay coil but it also supplies the Ign. Coil relay,
so it is ok since the car runs.
There is a 4 way pressure switch that feeds the AC module and the Engine Control Module
to tell when different pressures are reached.
From the 4 way pressure switch you should have 0V on the blue w/ black tracer wire
if you have at least 29 LBS (2 bar)
I have had my pressure switch fail.
Veteran Member
Joined: Mar 2008
Posts: 5,390
Likes: 1,116
From: Ellijay
Yeah . . . what he said. Perhaps I would check fuses, relays and connectors before jumper wire but you are going to have to trace from compressor clutch back. The clutch is fed directly from the Climate Control Module with the pressure switch the focal point of operation. Since this is first real test of the A/C after a cold winter I would still go with the static pressure or the pressure switch.
What static pressure did you have?
What static pressure did you have?
Trending Topics
I did an a/c check at the control panel and got a code 22 Compressor lock signal low refrigerant charge, low compressor oil level, loose drive belt harness / connector fault Adjust items as required. I asked a friend to check the a/c and he told me that I had pressure!?
I am not versed on in the a/c area but I must take the info given to me and go with it. Lew, you said to bypass and provide power to the compressor and you may be on to something. I am thinking that the relay may not be working for the a/c system. I am going to get a new relay and give it a try.
I am not versed on in the a/c area but I must take the info given to me and go with it. Lew, you said to bypass and provide power to the compressor and you may be on to something. I am thinking that the relay may not be working for the a/c system. I am going to get a new relay and give it a try.
Yeah . . . what he said. Perhaps I would check fuses, relays and connectors before jumper wire but you are going to have to trace from compressor clutch back. The clutch is fed directly from the Climate Control Module with the pressure switch the focal point of operation. Since this is first real test of the A/C after a cold winter I would still go with the static pressure or the pressure switch.
What static pressure did you have?
What static pressure did you have?
Where is the pressure switch? I am having one hell of a week and I am doing this in the evening.
I checked all the fuses and they are ok!
Fuse #8 10A Engine Management Fuse Box supplies 12V to the clutch via the relay.
This fuse supplies only the Comp. Clutch.
Fuse #14 10A same fuse box supplies the relay coil but it also supplies the Ign. Coil relay,
so it is ok since the car runs.
There is a 4 way pressure switch that feeds the AC module and the Engine Control Module
to tell when different pressures are reached.
From the 4 way pressure switch you should have 0V on the blue w/ black tracer wire
if you have at least 29 LBS (2 bar)
I have had my pressure switch fail.
This fuse supplies only the Comp. Clutch.
Fuse #14 10A same fuse box supplies the relay coil but it also supplies the Ign. Coil relay,
so it is ok since the car runs.
There is a 4 way pressure switch that feeds the AC module and the Engine Control Module
to tell when different pressures are reached.
From the 4 way pressure switch you should have 0V on the blue w/ black tracer wire
if you have at least 29 LBS (2 bar)
I have had my pressure switch fail.
did not see your post where is the pressure switch? I am unable to locate it.
Veteran Member
Joined: Mar 2008
Posts: 5,390
Likes: 1,116
From: Ellijay
The switch is located on a metal tube running along the bottom of the radiator an the engine side. JTIS has a drawing under 412.03 that I cannot figure out how to copy this early in the morning.
Senior Member
Joined: Nov 2008
Posts: 458
Likes: 9
From: Oregon - We don't tan we rust
Beyond the fuse chart there is a pressure sensor in the AC system that will prevent the compressor clutch from engaging based on low static pressure. Best solution is to put a set of gauges on the high/low connectors and see what the situation is. Static pressure should be about 35 psi if my memory serves (a more and more infrequent occurrence).
Lots of AC sites that I spent a lot of time on with the last car. I think I have the Jaguar pressure charts based on ambient temperature (high, low, temperature) if you want to add to your web site.
Lots of AC sites that I spent a lot of time on with the last car. I think I have the Jaguar pressure charts based on ambient temperature (high, low, temperature) if you want to add to your web site.
Veteran Member
Joined: Aug 2009
Posts: 1,205
Likes: 434
From: Milwaukee, WI
Veteran Member
Joined: Mar 2008
Posts: 5,390
Likes: 1,116
From: Ellijay
GreenJewel,
Here is the temp chart. As you can see, ambient temp is a critical factor in AC work. I believe that this came from JTIS. Just another one of those hidden bits only accessed by reading the help file.
Here is the temp chart. As you can see, ambient temp is a critical factor in AC work. I believe that this came from JTIS. Just another one of those hidden bits only accessed by reading the help file.
I recently went to Jaguar to get the relay I needed for the a/c and guess what? I got the wrong relay! Now they are unable to tell me what relay I need. As far as I can tell this one relay (brown) works in all the xk from 97 to 03 for the a/c. My problem is that I am not with the car and I need the # off the relay! Got to love it! By chance does anyone have that number?