Originally Posted by Jumpin' Jag Flash

Page 5-7 of the Drivers Handbook explains how the Climate Control System works. If you don't have the Handbook I believe it's available for download from the Forum for free.

Yes, normal. The default is for 'Auto' to be active when you start the car; when Auto is active, so is the A/C.

Auto deactivates (CC goes to manual mode) when I manually...
- deactivate the A/C
- adjust fan speed
- change the vent Mode
- push the interior/exterior air circulation button.

As you noted, with the A/C off, hitting the Mode button causes the A/C to re-activate. Presumably, this is because the first Mode selection is Defrost/Floor, and Defrost uses A/C.

Also note that if the outside temp is below a certain temp (don't know precisely what it is but it's approx. 32* F) you may see the rear defroster active when you first start the car.

Why is the A/C on by default in the Winter? Simple. The A/C removes interior humidity caused by the breathing, perspiring humans/animals in the car, which will fog the inside of your windows on a cold day. On really cold days this stuff turns to ice on the inside of your windows almost instantly. On our cars, the A/C and the heat are integrated and work TOGETHER as a Climate Control System, not against each other as one might think.

Operate your buttons any way you choose, but unless you guys in Chicago don't breathe or sweat in the winter, it's probably best to set the CC to Auto and simply adjust the temp to suit your needs, as JagV8 suggested. Then let your well-designed luxury car do what it was engineered to do.

Frankly, I wish they would design a home HVAC system that is as integrated and simple to use. Or perhaps they have?

Hope this was some help.
Steve

Originally Posted by JagV8

I've said before that it is. It is used to dry the air, as I posted.

Apparently you have a moisture issue. Well, no wonder, since you turn it off.

It defaults on. Think about that. Jaguar chose that so had their reasons. You've chosen to interfere but don't seem to have any real reasons...

Handbook is a free download, see Stickies / visit jag site.

Originally Posted by dcjag64

Thank you Steve,
I was guessing this was my lack of knowledge of how the CC worked, and you now have confirmed this. Thanks for the detailed operational function.

Originally Posted by Warspite

Amen, JJF! One thing to keep in mind: The more electronic features in your car, the more chance for failures. Every time you disconnect a harness or plug, spray the contacts with DeOxit D5 (or equivalent) as a habit. Good preventative maintenance.

Originally Posted by JagV8

Never had it reported on here, though, except maybe for ABS.