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'04 CTT only blowing hot air!?

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Oh dear....haven't used the car for a bit and now the weather's good and sunny decided to use it for a bit.

The car blows HOT air in the cabin, regardless of the temperature settings, manual or auto.

Airconpump doesn't seem to kick in either.

It's a 4-zone car and the rear doesn't blow hot air but on the lowest temperature setting it doesn't blow cold air either??

It seems as if either a temperature sensor packed up or the heater is stuck open or something?

Can someone please tell me where and how to start looking for the problem?

I have a good OBD-scanner if that's of any use...


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A quick and cheap check is to buy a 134A top up can from your local store and add some to the required pressure. My Cayenne lost AC driving through Georgia last summer. I topped up the refrigerant and she has been fine ever since. Of course, my car has over 100,000 miles on her


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Well the real problem isn't the aircon....the real problem is that it only delivers HEATED air....so I can't even use the car because of the heat inside....feels like the temperature swetting is on high :-(

If I could just switch to 'normal' cool air I'd be happy, let alone proper cooled air...

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