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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 06-04-2005, 01:58 PM   #1 (permalink)
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My car fan (engine side of radiator) is on constant. Is this a common problem?

It will only turn off by disconnecting or when my battery is flat!

Any ideas?

Is it possibly a thermostat?

Thanks

Mark
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Old 06-04-2005, 08:39 PM   #2 (permalink)
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hey , are you saying its running while the car is off?
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Old 06-04-2005, 09:37 PM   #3 (permalink)
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If equipped, try unplugging the sensor in the lower radiator hose (outlet temperature sensor)

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Old 06-05-2005, 06:21 AM   #4 (permalink)
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Quote:
Originally posted by Dirty_Tool@Jun 5 2005, 02:37 AM
If equipped, try unplugging the sensor in the lower radiator hose (outlet temperature sensor)

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Old 06-05-2005, 06:23 AM   #5 (permalink)
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Yes it stays on when the car is off.

I will try unplugging the temp sensor at bottom of radiator and let you know!
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Old 06-05-2005, 06:43 AM   #6 (permalink)
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The fan is permanently powered and will run at all time if there is a fault with the sensor or itís wiring itís switch on by the DME ECU
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Old 06-05-2005, 07:23 AM   #7 (permalink)
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Well tried unplugging the sensor in the lower radiator hose and it still remains on I'ts looking like a trip to my local BMW stealer
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Old 06-05-2005, 02:41 PM   #8 (permalink)
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Try unplugging the high pressure switch on the receiver dryer for the AC system.

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Old 06-05-2005, 10:30 PM   #9 (permalink)
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I Think you have a faulty fan switch, it can be unplugged to prevent battery drain but do not attempt to drive it in that condition, because the the car will run hot if you stop at a light.
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Old 06-06-2005, 01:37 PM   #10 (permalink)
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There is little control unit ( size of a match box) in fan itself that might be broken ( my car did). The sympthons were similar , fan did not stop without unpluggin it. You can't buy just control unit but you have to buy whole new fan if go you go to BMW dealer.
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Old 06-06-2005, 03:28 PM   #11 (permalink)
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I thought it would end with a new Aux fan. Booked in for Thursday - I will let you know.

Thanks everyone for the help

Olly
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Old 06-23-2005, 12:27 PM   #12 (permalink)
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Got it fixed by local BMW specialist - cost me £300. Now 100% and whilst it cost me more than I would have liked I'm happy again!

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Old 06-24-2005, 12:47 PM   #13 (permalink)
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I see you already made an appointment. I would find the fuse and remove it. You can still drive without the auxilary fan. If you idle for very long and the temperature outside is high, then you may overheat a little. Get it fixed quickly bya ll means, whether you DIY or take it in.
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Old 06-24-2005, 01:00 PM   #14 (permalink)
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Quote:
Originally posted by ollyh@Jun 23 2005, 11:27 AM
Got it fixed by local BMW specialist - cost me £300. Now 100% and whilst it cost me more than I would have liked I'm happy again!

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Gosh! What part did they replace for £300??? God save us all from BMW dealers!!
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Old 06-27-2005, 10:18 AM   #15 (permalink)
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The auxiliary fan is expensive. They only sell the whole assembly. I think it is more expensive than then main fan.
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