Your AC pushbutton control unit could be having a problem, or you have another problem elsewhere.

I would search on this and see what you come up with. I think others have had this issue before.

Hope that helps in your search for proper working AC.

I'm not a tech, but I think I remember reading about similar issues with faulty ac controls..

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon