Hi all,

In my low mileage 2007 XK the heater heats perfectly well, but after driving for about 15 to 20 minutes, I start to feel slightly cold on the left leg and need to increase the heat level 1-2 degrees.

Same thing whether AC on or off or with “Auto” enabled or not.

Any clues? Someone has similar issue?

Suspect:
Could it be a faulty internal temp sensor equipped with small fan (located behind steering wheel)?
Somebody replaced this temp sensor themselves?

br
ter

 

First step should be to get the DTCs (Diagnostic Trouble Codes) so you're not shooting in the dark and wasting time and money bt trial and error. Your initial suspicion may be right, and the DTCs will confirm that.

Try setting your climate control to recirculate and see if that makes any difference. I presume that you have checked for any coolant loss and that's OK. This thread might be helpful:
https://www.jaguarforums.com/forum/x...stency-117433/

 

I do not get any climate control related DTC codes.

Thanks for the great hint to the other thread. Interesting read.

br
ter

 

I had similar issue with a different non-Jaguar car. In that case, cold draft was related to incompletely closing outside air intake valve. If this is more pronounced at highway speeds, this may be the case with your car.

Turn on and off air recirculation and listen for odd noises as the initial diagnostic step.

 

Did you use a code reader that is capable of displaying climate control codes? I'm pretty sure that the inexpensive ELM327 bluetooth readers that use the free Torque app don't have that capability, but I might be wrong.

 

I used Autel ht200. It is pretty good with the jag-specific software download.

br ter

 

Is the "gets weaker" happen when the set temperature is reached and the actual HEAT is turned off because of that? If a person sets the interior to 72f, then the 'heat' stops when 72f is reached.

 

Hi all,

This is a problem mostly noticeable during Central European winter.

When I set a specific cabin temperature that is comfortable during the first ca 15-20 minutes of the ride, I need to add 1-2 degrees afterwards as I start to feel a bit cold in the leg area.

Then, when I get to destination and park the car without touching the temp settings eg. overnight, the next day after driving less than 5 minutes, I need to take the temp settings 1-2 degrees down again to avoid feeling very hot. And after another about 15 minutes it starts all over gain, ie. add 2 degrees to not feel cold...

Futher observations:
- The cabin sensor often makes a low buzzing noise, which is only noticeable with ignition on and engine off. It makes the same noise with engine on, but then not audible due to engine sound.

BR
ter

 

You have hit the nail on the head; this is a climate control system, not a heater/air conditioner. You set the cabin temp to the final temperature at which you want the cabin. It is perfectly correct and normal for the system to blend cooler air into the air flow as the cabin temperature approaches the set temperature. It will then contune to blend the cool and hot air to maintain the set temperature.

But if constant heat is desired, the process is simple: push the red heat arrow until it gets to maximum heat. Now you just adjust the fan speed to your liking, the system will continue to put out full heat until your toes burn. Note that it is NOT faster to reach a comfortable temperature this way than simply setting the control to your preferred temperature.

 

In addition to the selected temperature and distribution settings, interior temperature is controlled by the Air Temperature Sensor behind the little grille in the Instrument Pack trim. Over time this collects dust which affects actual temperature.




This is my RHD 2007 XK.

Graham

 

As described above, the system does not really work for me with a steady set cabin temperature. I know climate control from other cars, where I find it worked better for my liking and I basically don’t have to touch the settings.

br
ter