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There is a temperature switch plug-type thing on the driver's side of the radiator facing the driver. It has two leads on it. With the engine off, pull the leads off and connect one to the other by a wire or nail or something of that sort. Now start the engine. The fans should run. If they do not, it could be a relay or bad fans. I'll bet it is either this switch or the relay. I have a 1986, 951 also.
I would do this test before replacing the switch.
If you have to replace the switch, don't over tighten and ruin your radiator. This gets done upon occasion.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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