Ok, I have had this off and on a few times in the last couple weeks. 00 323i. I am driving with the snowflake lit up, temp at 61 with auto recycle on. Upper and middle vents lit up. Suddenly it feels really hot. Ice cold still blowing from front vents... the top vents by the windshield are blowing scalding hot air. If I turn on the floor vents as well, those blow super hot air, but the dash is still blowing cold the whole time. I did a search and others have had similiar problems but noone posts what they did to fix the problem. Middle wheel is on 3 blue dots. I have and have read the owners manual. I have replaced the thermostat and water pump and done a full flush. Car is not running hot. Weird thing is, I turn the car off, and then next time I drive it, it's fine.. no issue. Anyone??