Radiator cooling fan running extremely slow
Thread Starter
Junior Member
Joined: Dec 2010
Posts: 15
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e320
Radiator cooling fan running extremely slow
2002 E320 running hot, close to 90 degree when in slow traffic. Pull over, and check fan. It is running, but very slow. When I arrived home I disconnected fan plug and applied 12Volts to fan terminal. Fan ran at high speed for a period of time until 12v was removed. Fan appears to be Ok. Where is the control module located to regulate fan speed??? Any suggestion will be appreciated.......Note year of car...2002
VIN # WDBJF65J32B490401
Thanks
D.Wongsam
VIN # WDBJF65J32B490401
Thanks
D.Wongsam
Last edited by dwongsam; Feb 18, 2014 at 08:47 AM. Reason: VIN # required,,,
Senior Member
Joined: Jan 2010
Posts: 301
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1997 E300D
I would guess you consider 90 degrees as hot, because your car likely runs at around 80 on the highway, but 90 is not hot in my opinion for an engine in stop and go traffic. That is about 194 degrees Fahrenheit, and well within the range engines are designed to see. The electric fan may just have a higher set point before high speed kicks in.
Senior Member
Joined: Sep 2008
Posts: 293
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From: Chicago
2002 E430 4MATIC
As nelbur said....90c is not hot. It is at the upper end of normal and very typical of stop and go traffic. If you are at 100c with the aircon on and the fan is not working at high speed, then you might have an issue.
Junior Member
Joined: Dec 2016
Posts: 16
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1999 E320 wagon
Very helpful thread, probably good to bump it this time of year. I bought my '99 E320 over the winter, now that it's warming up I noticed the temp climbing while idling in traffic and that the cooling fan (mine has only the single fan) turning very slowly.
This thread nicely explains that both and stopped me from buying a fan! Thanks
This thread nicely explains that both and stopped me from buying a fan! Thanks
