Maxima Automatic Air-Conditioning/Heater problem

[asdean]

I have a 2000 Maxima SE with the automatic air-conditioning/heater system.

The auto air has always worked well, sending warm air thru the bottom vents (by the feet), and cold-air thru the middle vents (by the console/radio). In the winter I could set it at 68 degrees and forget about it, and it would always warm up the car just fine. In the summer, I would set it to 75 degrees and it would keep the car perfectly cool.

Suddenly, the system started acting really weird, and I can't figure out the problem. While cold air would never come out of the bottom vents in auto-mode before, now cold air comes out of the bottom vents, unless I crank up the temperature to over 82 degrees. If I set it any lower, it goes from warm air to cold air very quickly.

Has anyone else run into this ? I would really appreciate any ideas.

[audtatious]

Sounds like the vane that directs the airflow may not be moving appropriately. Then again, I may be way off base.

If nobody has any additional thoughts on this then the thread should be moved to Online Mechanic for assistance.

[Jesda]

Blend door and heater core immediately come to mind.