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Old 02-20-2016, 08:33 AM
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Join Date: Aug 2000
Posts: 67

Dear All,
I have a 2008 R class diesel the cooing fan dose not run. I am looking to locate the fan module I did not see it on the fan. Useing the OBDII it can be commanded ON. I have changed the temp sensor no fix Please help.
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Old 02-20-2016, 12:50 PM
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Join Date: Jan 2012
Posts: 7,179
There should be a fuse for the power feed, check that.

Next, check for power and ground at the fan.

You could disconnect and power up the fan directly to make sure the motor is good.

Past that I'd have to see a wiring diagram.
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Old 02-20-2016, 08:17 PM
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Join Date: Aug 2000
Posts: 67
R320 CDI

First thank you. I have checked the fuse it's good the fan will run at full speed if the temp sensor is disconnected or if air con is selected. It will not run at high coolant temprature . I have had a couple thermometer in the sea warning please advise. I have looked up and down for the so called FCM I can not find it nothing on the Fan.
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Old 02-21-2016, 07:28 AM
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Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,250
It will not run at high coolant temprature .
What kind of temp are you talking about?
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