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Old 05-31-2004, 02:51 PM
Registered User
Join Date: Oct 2002
Location: Vanersborg, Sweden
Posts: 99
Radiator fan always on - Help

Hello Friends,

The last week I have noticed that my cooling fan (the electrical one in front of the radiator) is always on. Im not sure what to look for. Can anyone of You help me with some hints?

Many thanks in advance!

Mikael Westerberg
1984 500 SEL
Vanersborg, Sweden

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Old 05-31-2004, 03:01 PM
Registered User
Join Date: Oct 2002
Location: Vanersborg, Sweden
Posts: 99
Ooh And another thing while Im at it. The engine stumbles and stutters quite a bit at cold starts and goes back to normal running after a short drive (as if its to lean). I guess that there is probably a sensor gone bad which makes the engine beleive its always hot but i just dont know which one to look at.

Thanks again/ Mikael
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Old 05-31-2004, 05:57 PM
Join Date: Jun 2003
Location: Dallas, Tx
Posts: 190
The top hose between radiator and the engine connects to hose connector. In top ot this connector the temperature sensor is screw in. Disconnect the plug/plugs connected to the sensor. The pug with two wires control electric fan. The first stage if temperature rich 105C and second at 120C. The temperature sensor is close and electric fan works continuosly when car is on. You can drive car temporary with out this sensor and later replace with new one.

86 420SEL 225K
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Old 05-31-2004, 08:53 PM
Likes DIY/Tech'y inclined
Join Date: Sep 2002
Location: San Francisco Bay Area
Posts: 452
aux fan

Does it run LOW or HIGH? Make sure A/C is OFF. If LOW, refrig fan switch on A/C drier is bad or relay is stuck. If HIGH, Engine temp sensor bad or its relay is stuck. Find out first if the aux fan stops running at its particular speed by disconnecting the relevant sensor. If that does not work, try replacing or switching the relays. There are two relays for the aux least for my car and they are the same type. Hope this helps...

good luck,


'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen
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