Last Sept, my a/c stopped working in our 06 XK and we took it in and had it fixed (replaced evap, drier, expansion valve and fixed a blend door). Everything was fine after we got it back.
In Oct, my wife drove from FL to VA and about 2.5 hrs in to the drive, the air coming out of the vents slowed down and warmed up. You could feel a little bit of air coming out, but nothing like it should. If you stopped, for gas or to get food, when you get back in the Jeep, it would work again for a little while and then stop working again.
I took it back to be looked at, and they 'couldn't replicate the problem' and gave the Jeep back. Over the next few months, it was never driven long enough to put it in a situation to stop working, so I couldn't bring it back to be looked at.
I recently drove to the mountains (4hrs each way) and about 2-3 hours in, the heat was barely able to be felt blowing out of the vents.
A few notes:
-Turning the recirc on/off has no effect. You can hear the recirc blower turn on, but it doesn't change the force of the air coming out of the vent.
-Switching from feet/head/defrost doesn't change anything either.
-The controls are on manual and not auto, and it does it on both passenger and driver sides.
-Changing temps doesn't change anything
-Switching the speed of the blower doesn't do anything, on low you can barely feel anything and on high it feels like it should on low.
I think there is some thermal cutoff that is being reached in the blower, but I am no a/c man, so I don't know if there is one. It isn't 'freezing' up, because it does it on heat or a/c once you have been in the Jeep for the right amount of time.
I have it back at the shop now, and they can't get it to replicate the problem. They replaced the blower motor resistor, but they never got it to act up in the first place. I don't really think it was the resistor since most of what I have read had different problems if it was the resistor.
There obviously is a problem and I need it fixed before I drive to Daytona for vacation in June in the blistering heat.