| It's probably the blower regulator located in the blower motor area. Very common to go bad. You'll have to remove your wiper assy to get to it.
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2003 c320 Sedan - Completely updated to 2005 spec with all euro and usa options
2002 s500 Sedan - Completely updated to 2006 spec with all USA options and some euro options. http://web.mac.com/motorwerks | 
