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Old 08-21-2002, 10:44 PM
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cooling fan runs constantly '93 300e...advice needed

just when i thought everything was right, i have noticed that the right electric cooling fan is now on constantly with the ignition switched on or engine running. this is happening regardless of engine temperature or if the a-c is on or off. any leads on where to start diagnostics appreciated!

thanks in advance,

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Old 08-21-2002, 11:03 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,141
Don't recall the name of the electro-gadget, but the SOHC M103 cars have a sensor near the front that goes nuts sometimes if the engine has been cleaned in a car wash. I learned this from a tech at another site.

Hopefully someone will chime in with the name/actual location.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC

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Old 08-21-2002, 11:10 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
Your car should have a 104 eng.
Check the blue 2 wire temp switch on the thermostat housing
for open circuit/unplugged,
This is aux fan cut-in sw. It is a temp changing thermister and an open/ unplugged/bad connection will cause fan operation.

Curious to ask about "Right Fan " ??? in your post...
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Old 08-21-2002, 11:44 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
Yeah, no ghost chasin allowed..
Next time you get a fan on . give the other one a twist and see what u get...
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