I have an 82 300sd. The auxillary cooling fan has quit working(it ran all the time).
At first I thought the fan had gone bad, but then I accidentaly found that the fan will run if I press on the fan. I can "push in" on the screw sticking out the front of the fan motor and the fan starts running (no I am not kidding). Before I run out and buy another fan I want to make sure that the one I have is bad. Is the fan bad or could it be something else?

That one has failed. This is the most common way that they fail.

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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

Due to motor design you are putting pressure on worn out motor brushes & then they touch armature again. New motor needed!