The fan clutch on these do fail and will cause this!! The temp gauge can be checked for accuracy with a resistance substitution box...I don't remember the exact ohms. Your QUALIFIED technician will be able to help.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM