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Old 06-23-2001, 08:12 AM
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My electric fans never turn on, even in town. I just wonder at what engine temperature they should kick in and how to test whether they work or not?

Many Thanks

Martin Wollny
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Old 06-23-2001, 08:32 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Assuming the car is a 1994 model, the fans(low speed) should come on with A/C whenever the pressure is 225 lbs@sqin or higher. The engine temp switch is set for 107C to turn the fans to high speed! If the low speed fans aren't working there is a relay in the rear section of the fuse box that has a plug-in fuse. BLUE relay, try replacing fuse!
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Old 06-23-2001, 11:04 AM
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Join Date: Nov 2000
Location: Houston, TX, USA
Posts: 185

I have a 92 400e, with the same problem. I just replaced my engine wiring harness as all the wires were corroded and I thought this could be the problem. Well, it wasn't. The fans don't kick on with the AC or when the car gets over 107c. Does this car have the relay too, and should I check this before changing the temp sensor?

Peter Balias
1992 400E
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Old 06-23-2001, 11:22 AM
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Join Date: Dec 2000
Posts: 368

Did you try unplugging the two pin coolant sensor. If the fans don't turn on, you most likely have a bad fuse or relay.

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Old 06-23-2001, 01:20 PM
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Thanks everybody. I've just been driving the car and I checked the fans. They work when air-conditioning is on so I just suppose that my car never hits 107 degrees.

Forgot to mention - the reason that I was not sure about the temperature is because of the faulty gauge. It shows 50 degrees when the temperature should be around 80.

Martin Wollny
93 E500
72 280SE 3.5 manual
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