By the way they are wired, it almost has to be a faulty fan. They share the same ground and power input. If you hit the fan on the nose of the motor with the other one on, it may come on. If so, it is at fault and should be replaced soon.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM