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Old 10-08-2009, 11:30 AM
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Join Date: Sep 2009
Location: Sunny Florida
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Exclamation Aux. Fan not working...Any thoughts?

My Aux. Fan on my 1984 300 DT is not coming on. Does anybody out there have the answer to this one? Any answers to this would be greatly appreciated.
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Old 10-08-2009, 12:43 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
Mine turned out to be a dead fan. With the ignition switch in the "run" position, jumper the wires at the drier, and see if the fan comes on. If not unplug the fan and check for voltage at the plug. If no voltage, check the relay that is on the driverside fender and check the fuse.

Remember that fan is controlled by freon temps at the drier. That temp switch can go out as well.

70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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Old 10-08-2009, 07:12 PM
280EZRider's Avatar
No Dumping
Join Date: Jul 2007
Location: Medford, OR
Posts: 1,432
I recently had a similar problem & resolved

W123 Aux Fan

Don't Chrome them; polish them
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Old 10-10-2009, 09:42 PM
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Join Date: Sep 2009
Location: Sunny Florida
Posts: 57
I figured out the problem. The plug that comes off of the aux. fan to the power was all distorted like it was heated up and covered with grime. I cut the two ends off and put on new connectors, plugged them together and now the fan works perfectly. Easy fix and A/C works great!
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