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      01-04-2013, 01:42 PM   #1
I sweat pheromones
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Drives: e92 335i, retired SLK55
Join Date: Jul 2009
Location: NorCal

iTrader: (25)

Radiator fan - say it ain't so

I have an intermittent problem. Car hasn't thrown any codes. I'm fearful of what these symptoms imply. I'd like some feedback please.

Car is running strong.
Normally, fan and engine temps are all within normal ranges.
Recently, on long drives, the fan kicks run extremely high rpm's. It does this regardless of ambient or oil temps.

As an example, drove around town on 10 min trips in 50F weather. Fan was normal and oil temps were around 200.

Last few hour long trips.... Ambient temps around 40F at night. Oil temps around 220. Then, all of a sudden, fan kicks on overtime. Car has normal power and doesn't thrown codes. As I'm nearing home, oil temps are all the way down to 165F. I come to stop and hear the fan screaming. Turn off the car and averything is fine again until I go on a norther long trip drive.

What's the deal? Bad thermostat? Failing water pump? Both? Something else?

Car is at 102k miles and never had any of the above replaced.