had the same problem with mine... spent a few bucks to check the easy things. flushed the radiator. filed it up with new mb antifreeze. new thermostat. no problems since. Replaced the fanclutch first but i probably didnt need to, although it may be an issue to look at.

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1994 C280
2009 VW Tiguan
1993 Toyota X-tra Cab SE-5


1973 220D ... Gone, but not forgotten
1991 Alfa Romeo 164L Gone, wife MADE me forget it

2006 Hyundai Tucson... just straight out FORGOTTEN!