I have a May of 2005 CRD Jeep. I just got home from a 400 mile trip to central Florida and back. Absolutely no problems until I got 100 feet from being home. I am not happy that it is broke, yet very happy it waited!

The A/C suddenly went to heat mode! It was very sudden, as if I turned the knob all the way to heat. The compressor is still running, responding to the A/C on-off button. The refrigerant lines under the hood are cold as expected. The Jeep is not running hot. I suspect that whatever the hot to cool knob controls is malfunctioning, but don't know what that is.
Is it a flapper door hidden deep in the dash, or is it a radiator coolent valve? I have seen both types on other cars.
I didn't see any fuses that seemed to correspond with this, but checked the ones that had to do with heat, fan, and A/C.

Any advise, please?

_________________
--2005 Jeep Liberty Diesel - Wife's playtoy, mine to MOD!
MAP- Cleaned!, ORM- DONE!, EHM- out the bottom with ya!
Thank you Sir Sam

Blend door failed towards heat?

_________________
2006 Liberty CRD Limited

Provent @ 43,000 km
SEGR in progress
SAMCO Sport hoses @ 48500 km
Goodyear Wrangler Duratrac LT225/75R16

yea, that was one of my guesses.. its location? electrical or vacuum?

_________________
--2005 Jeep Liberty Diesel - Wife's playtoy, mine to MOD!
MAP- Cleaned!, ORM- DONE!, EHM- out the bottom with ya!
Thank you Sir Sam

Do a search here on "Blend door"....there have been quite a few questions raised regarding the blend door operation.

_________________
2002 Export CRD 2.5 Sport

You have Sir Sam's Noob Guide linked in your signature. Download the service manual. Shoud have the answers you seek.

_________________
2006 Liberty CRD Limited

Provent @ 43,000 km
SEGR in progress
SAMCO Sport hoses @ 48500 km
Goodyear Wrangler Duratrac LT225/75R16