The manual states the fan clutch engages when the engine operating temperature is about 95 C. It also states that it can be clearly heard. I don't seem to be able to tell the difference or the clutch has failed. Further a sheet of kleenex barely clings to the aux fan housing when the engine has reached almost 100C.

Am I nuts or is the fan clutch a goner?

------------------
1991 350 SDL
114,000 miles

The fan clutch on this car will not positively engauge, but rather will come on slow. The aux fans should run above the 105-110mark. Also the fans will come on with the A/C on when the temp on the condensor is up.

------------------
Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Unfortunately the fan seemed to run at the same speed from about 85 - 100C. The aux fans work fine on both high and low speeds.

Shouldn't the clutch speed things up in that temp range?

------------------
1991 350 SDL
114,000 miles