Hello, I have a problem with the air conditioning system that I cannot solve. When it's cooler, it blows cold air, when it's very hot outside, after about 5 minutes, it starts blowing hot air. I changed: compressor, passenger compartment radiator, AC radiator. I don't think the cooling fan is revving up, that is, I don't hear it increasing its revs. The compressor starts - it stops and the clutch starts to slip. Could you please help me? Thank you

 

Welcome to the forum. Have you seen my troubleshooting guide?:

https://www.jaguarforums.com/forum/s...ol-how-185002/

Follow the guide in order and hopefully it will lead you to the root cause(s).


Big question here about "blowing hot air". Is this air the same as ambient, or warmer? If warmer than ambient, that means heat is making its way into the ducts when there should not be any. The most common fault causing this is a bad Dual Climate Control Valve (DCCV). See post #2 in the troubleshooting guide for details on how to test the DCCV.



For the "passenger compartment radiator", are you talking about the heater core inside the dash? I understand this is a HUGE undertaking, with lots of disassembly required for access. Did you take any pictures or keep any notes about how to do it? This would really help out the next guy.


Can you please elaborate how you determined the clutch is slipping? Post #4 in the troubleshooting guide has details of one method, using paint marks and a small jumper wire in place of the control relay. On my car, I've had two situations where the compressor was not spinning at full speed. One time it was due to bad relay, reducing power to the clutch coil. It's a simple matter to swap relays for troubleshooting. Another time I thought the clutch may have been slipping but instead it turned out to be the serpentine belt. See post #18 for details on the serpentine belt.

 

A specific sound is heard. When I looked at the compressor, I could see how it was trying to stop it, but it was succeeding.

 

I changed the fan, I'm waiting to see if I still have problems. For now it is very cold outside and I see that the air conditioner is working.

 

Thank you for all