Question about 1983 Mercedes-Benz 300-Class

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Automatic fan is not on

The fan is good /fuses good....What turns this fan on???

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The coolant sensor from top of the engine near the air filter, not the one in the back of the engine, will turn the fan on when it indicates temperature hot or open. Take off the connector when the engine running then the fan should turn. If it is the case then the fan motor is good. All you have to do is to replace the coolant sensor.

Posted on May 04, 2010

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fist start the engine and turn on the a/c that should command the fan on.
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here you will find a single plug with 4 wires in it

black = ground
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unplug the relay ground your test light to the battery negative terminal, with the engine running and a/c turned on check the gray wire the test light, it should turn on if not recheck fuses.

move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan.

good luck

wesley schacht@hotmail.com

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