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Old 11-12-2003, 05:54 AM
Registered User
Join Date: Jul 2003
Location: Atlanta GA
Posts: 16
Question Aux fans running engine hot

W124 1995 E320 124,000 miles.
My car is running hot (about 100C+) and both aux fans are
runnning on high.
When the engine is cold the fans are not running. With a hot engine they run high, I tried it with the climate control off-same effect. The clutch driven fan is working Ok.
I would suspect the temp sensor if it wasn't for the higher than usual engine temps.
Is it the water pump?
Thanks in advance.
1995 Mercedes E320
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Old 11-12-2003, 07:53 AM
Registered User
Join Date: May 2003
Location: DC Metro Area
Posts: 365
Check thermostat

I'd check (replace actually) your thermostat first. At 124k miles - it wouldn't hurt to change it. It could not be opening fully - causing your woes. This shouldn't be that expensive.

If this has no effect - Thoroughly clean the cooling fins of your radiator.

If this has no effect - you may want to have your cooling system drained, flushed with a citrus "decalcifying" solution (MB makes such a product, I believe) and fill with proper coolant (the red MB stuff - NOT the green stuff).

Your coolant temp sensor sounds like it's working fine - as it is activating the fans when they are supposed to come on.

Let us know how you do.

1995 E420 72k
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Old 11-13-2003, 08:24 PM
Registered User
Join Date: Jul 2003
Location: Atlanta GA
Posts: 16
Well Troy was right, the themostat was stuck in the closed position. I boiled it out of interest.

I put in a new thermostat and everything is working -
the engine runs at about 80C. I'm going to replace all the radiator hoses as a preventative measure.

I think that having the car sit for a while when I replaced the evaporator caused some of these gremlins.


1995 Mercedes E320
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