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Old 12-01-2017, 10:36 AM
koreanknife koreanknife is offline
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engine overheating at idle - cooling fan

My 2011 328xi N51 SULEV overheats when I idle for a while, like in traffic or very slow drive-through. I thought that it may be the thermostat or water pump. I took it into a shop to have it diagnosed, and it turns out that the radiator cooling fan does not kick on. It's getting power from the connector. I noticed I haven't heard it turn on in a while...

No code faults were given.

Could it be the cooling fan switch? I hope so, as it's only $13, and ordered one. I will update if this makes the fan turn back on.

If the cooling fan needs to be replaced, which fan do I need to get for my N51 engine? They seem to be engine specific, but I am having trouble determining if I need to 400W or the 600W. If someone can point me to a good deal for one, I would really appreciate it.

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Old 12-01-2017, 10:51 AM
e92_dub e92_dub is offline
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are you certain it's not the water pump? I had the same issue with my car (335i N55) and I also didn't get any codes but it ended up being the water pump.

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Old 12-01-2017, 01:03 PM
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Yours is 600 w.
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Old 12-01-2017, 08:44 PM
koreanknife koreanknife is offline
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I'm not 100% sure it's not the water pump, but just trying to work at the most obvious problems first. Since the fan is not cycling on when commanded to, there is an obvious problem there. I can get the water pump when activated to move the coolant using the bleeding procedure.

Does anyone know if the fan doesn't turn on during long periods of idling, is the water pump enough by itself to cool down the temperature?
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Old 12-01-2017, 08:53 PM
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fan should come on if your car is overheating, one thing i read previously is that the AC should make it come on regardless of the cooling fluid temperature.
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Old 12-06-2017, 07:07 PM
koreanknife koreanknife is offline
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Got my radiator fan replaced. fixed the overheating issue. mechanic said that there is a larger than normal lag between the top and bottom radiator hose temps and to keep an eye on the thermostat. feels good to have the car running normal temps again.
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