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Old 11-25-2019, 04:31 PM   #1
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Join Date: Jul 2013
Location: Minnesota
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e83 radiator cooling fan diagnosis

Trying to prevent my 2008 X3 from overheating. The electric radiator fan doesn't seem to run, no matter what the coolant temperature or whether or not the air conditioner is turned on. I have tried a number of possible solutions:

- removed fan and replaced with a known good fan from a different X3. The replacement also doesn't run, however, it is rated 400 watts vs. the 600 watts that came with my 2008 X3.
- checked for power at the socket, getting 12 volts.
- checked coolant temperature using torque app to test whether or not the coolant temp sensor is working. It appears to be good (shows ambient temp at start up going to 160-180 fahrenheit on the highway and then over 200 degrees when stopped and idling.

Running out of ideas. Is it possible that the DME somehow senses that the 400 watt fan is not the right one? Should I go ahead and buy a 600 watt fan and see if that fixes the problem?

I have done a ton of searching this site and elsewhere and I am stumped.

As a last resort, I am thinking of buying an aftermarket fan (mishimoto) with sensor and installing it in the BMW shroud.

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