Hi guys. Here is what is going on. Any help with diagnosing the issue would be much appreciated (2010 XKR with 19,000 miles).

So, there are a bunch of oddities, but in no particular order....

1) The AC air temp (even when set on low) is not nearly as cold as it was. It's now just below "cool", but not cold.

2) When I turn the AC on, I no longer hear the the compressor clutch "click", as you normally do. I do though notice a slight drop or raise in RPM when I turn it on or off, but the clutch "click" is not there. That tells me the message is being relayed to the compressor from the interface (AC on/off button), but I don't know why the clutch isn't engaging/disengaging.

3) There is definitely a difference in air temp between the AC being on, and the AC being off, so SOMETHING is working.

4) While driving today (stop and start town driving for about 20 min total), the AC suddenly got really cold 2 separate times (a few minutes after starting the car and getting on the road), as it did before this issue today. That tells me that the compressor is functioning properly when it gets the signal it requires, and that the system is charged with refrigerant (at least some?)

I'm much better with mechanical than electrical (quite useless at the latter), but would I be right in thinking that this seems more like an electrical issue that something mechanical like the compressor, etc.?

Thanks, gents.

 

you won't hear a click. These compressors have no clutch. Your symptoms are typical of low refrigerant. Read this and pay attention to post 9 and 23.

https://www.jaguarforums.com/forum/x...-light-201419/

 

Oh wow, thanks Sean. I hope that is all this is. That would be a LOT cheaper than what I have been fearing.

 

sean.....what do you think the noise is though? related? when AC is off, there is no noise, so obviously related to my AC issues, but just wondering how that would relate to low refrigerant. tnx.

 

You are more than likely low on refrigerant. You can get a charging kit from Walmart for less than $20. It will contain a can of R134a, a hose with gauge and valve to charge the freon. Read the directions and you will at least have a good idea if the charge is low or not.

When you are moving with air going over the A/C condenser and the compressor running at higher speed the system will deliver cool air, even it is a little low on charge. When you stop or the outside temperature is higher the cooling will be reduced. This is typical of a low charge.

If charging it does not fix the problem then you probably need to take it in as you have a more serious problem.

 

that would be fantastic!

 

Those cheap kits didn't work for me. The gages don't seem very reliable. Last time I used one I overcharged the system by about 1 pound (I found this out when I took it to a shop to have them check).

 

Not enough miles and engine operation to keep stuff working like it should.
While in the Air Force I learned that you can rag the hell out of a jet for three straight weeks, no problem. Keep it down for two days and it'll break all to heck.
Seriously.

 

How much did you put in? These systems take only 24 oz to fill completely. You have to read the gauge, temperature, and chart right. If you in a whole extra pound you did something wrong.

 

update.....now the AC is working great. ice cold and stayed that way since the moment I started it this am, and then on the 20 min drive to the gym and then back home 90 min later. but, the weird high-pitched and high-frequency sound is still there intermittently. very odd. what do you guys think about these two facts?

 

High Pitch Noise issue..
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Cheers,

Dave

 

nice! tnx, dave! you rule. i'm so glad to now know what that is, and it seems like a pretty cheap fix.

 

I have similar issue but ac works when I'm on highway and rpms are above 2,000 when they go down below 2,000 cold air is gone... i read online that there is a TBS for specific vin range that had issue with AC direct pressure sensing valve:
https://jlr.oemdtc.com/69/inadequate...10-2016-jaguar

Check if your car is part of the affected vin range..

 

and the dealer will cover that if i'm in the VIN range?

 

i dont think so because it is TBS not a Recall, but it would be a worth a try, I'm going to email closest Jaguar dealer to find out if they cover that or if not what would be the cost to fix it

 

true, true.

ok, i'm interested to hear what they say.....

 

so i emailed closest dealer about issue with my A/C and this is what the service manager replied to me:
"The bulletin you're referencing may apply to your vehicle, however it does not cure the same symptoms you're referring to. Usually when an A/C system only cools at high RPM's we see a flow issue. There could be an expansion valve failure, blockage in the condenser, a failing pressure switch, or even an engine cooling fan issue causing your problems.

The best way to determine the nature of the failure is to bring it in so we can test the pressures of the system and make sure that all of the related controls are operating as designed.

The cost for diagnosis is $164.88"