electric fan wire routing - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 07-29-2008, 01:32 PM Thread Starter
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Vehicle: 1971 Mercedes 280sel (w108)
Location: Nixa Missouri USA
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electric fan wire routing

I have a 1971 280 sel. The electric cooling fan is wired to a small ceramic terminal block under the dash next to the hood release. The problem is the fan only comes on when one opens the driver car door. I know that is not the proper wiring for this, and would like to properly re-route the fan wiring. Also, I sure would like to know what that ceramic terminal block is for, cause there is nothing else wired to it. I'm trying to get this car back as original as possible, but over the years others have done some funny rigging. Any help sure would be greatly appreciated.http://www.benzworld.org/forums/imag...s/confused.gif
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post #2 of 3 (permalink) Old 08-01-2008, 04:19 AM
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Do you mean the Auxillary fan on the front ? it should be wired hot to the fan and the earth runs through a temp. sensor on the thermostat housing(97 C). What happens quite often ,is the fan stops working and some clown cannot understand that there should be power at the fan all the time and they wire up the fan to some strange places. In your case it has been wired into the door switch . ( is there a grey and brown or red twin flex lead nearby ?) .

The fan should be wired from a relay through a fuse near your brake master cylinder. The fuse box is above the relay. Some cars have a safety switch there too. Power to the fuse should come from main fuse #2 . Depending on the cars build date it may also have a temp. sensor in the aircon gas line which turns the fan on when the tempo. gets too high(67c).In that case there will be two relays and fuse box. The fan and the aircon should have a fuse box,next to this is a relay for switching OFF the compressor clutch,a relay for aux. fan beside the safety switch . This safety switch turns the fan OFF when the hood is open,so when checking the fan ,use a bit of tape to hold the switch down...again this is a thing overlooked and is a cause of dodgy remedies to get the fan working.
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post #3 of 3 (permalink) Old 08-01-2008, 09:09 AM Thread Starter
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mercmad6.3 thanks a million! Sounds like you know exactly what you're talking about. I'll check this out after work and hopefully get it working. Speaking of dodgy remedies, this same car had the factory fuel injection removed and a SU carburettor put in place of the throttle body on the existing intake manifold. Pretty squirrelly, but it does seem to work fine. Just not quite the horsepower I'd like. But that'll get fixed somehow. Again thanks a lot for you help.
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