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Old 07-11-2001, 11:48 AM
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My '85 300D has been blowing aux fan fuses. I replaced the fuse (16a) and the fan runs, but now the fan just doesn't come on. I saw the trick with grounding the temp switch wire to make the fan come on, but my question is:

Was the temp switch potentially causing the blown fuse or should I be looking at replacing the fan motor (or relay) to really fix the problem????

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Old 07-11-2001, 04:46 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Rusty the switch is only a trigger for the RELAY that controls the motor. THE only thing that should blow the fuse is the MOTOR itself.
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Old 07-12-2001, 09:39 AM
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Remove the battery and/or windshield was reservoir and check the wires leading from the fuse bosx to the fan. I had a similar problem in my '76 230 and found out that the wire (down around the headlamp area) was frayed and chewed out (from what I don't know, an animal maybe or just rust) and then I cut out the bad parts, spliced the wire and used butt connectors to re-attach the wire, so it was'nt exposed. This worked fine.

Good luck,


1976 230.4 W115
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