Hope someone might know the answer to this. Most times when starting to go anywhere whether its morning, noon or night the heater will come on full blast. The only controls available then would be to swith it to the floor or to up top on dash. Fan speed does not work. A/c will not work. Then while driving it will automatically start working properly again. Funny thing is that it might do a day or so without doing this or do it everytime I get into the car. When it does this it becomes very hot in the car shortly. Hope I have provided enough info and if not please let me know. I welcome any help at all. This is a 2002 slk 230.