Be sure that the auxillary fans are operational on low speed. With the car at idle and the a/c on, if it is hot, the aux fans should be on because of high a,c pressures.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM