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Old 07-30-2001, 11:56 PM
Registered User
Join Date: Dec 2000
Location: Montgomery, Alabama USA
Posts: 61
Fan trouble again --- help please

I recently replaced the radiator (cracked), thermostat (stuck), and aux fuse (blown) due to overheating problem. This fixed it I thought, but today temp creeped up and aux fans never came on. Later they worked fine, but them stopped working again. The fuse is ok this time.

Does anyone know what all is in the circuit that controls the fans? My manual doesn't show the fans in the wiring diagram for some reason. Is there a resistor and/or a relay? I assume there are 2 sensors and I think that I can find these but I don't know what else.
Ken Fuller
1990 300E
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Old 07-31-2001, 06:49 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
You really need to go to the PartsShop here and purchase the 124 CD Rom set. I has ALL of the wiring diagrams for your car!!! The diagrams are the best part of the CD's!!!!!

You probably only have the fans working on the high setting. You need the low to work when the A/C is on.

Good luck
Donnie Drummonds
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Old 08-01-2001, 12:06 AM
MikeTangas's Avatar
Senior Member
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
The fan should show in the diagram as a circle with an "M" inside - signifying a motor. Trace out the line from the thermo switch and it will lead you through a relay (possibly a 5 pin) and out to a circle M.

Keep in mind there are several circle M's; fuel pump, blower motor, starter just to name a few.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon least its a diesel

Non illegitemae carborundum.
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Old 08-01-2001, 04:17 PM
K Juul
Posts: n/a
Just a thought, but are you sure you bleed the cooling system well. An air bubble will cause overheating and if it happens to be in the area of the temp sensor the fans won't come on. I second the praise of the CDs. They have answered many a question for me.
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