Radiator Fan Stuck On Permanantly

[ollyh1973]

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
ghead

[Furious]

hey , are you saying its running while the car is off?

[Dirty_Tool]

If equipped, try unplugging the sensor in the lower radiator hose (outlet temperature sensor)

DT

[ollyh1973]

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)

DT

[snapback]350830[/snapback]

[ollyh1973]

Yes it stays on when the car is off.

I will try unplugging the temp sensor at bottom of radiator and let you know!

[bad man working]

The fan is permanently powered and will run at all time if there is a fault with the sensor or it’s wiring it’s switch on by the DME ECU

[ollyh1973]

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

[Dirty_Tool]

Try unplugging the high pressure switch on the receiver dryer for the AC system.

DT

[clarkinc]

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.

[yepyep]

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.

[ollyh1973]

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

[ollyh]

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!

Ollyh

[drz]

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.

[AIO]

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!

Ollyh

[snapback]356300[/snapback]

Gosh! What part did they replace for £300??? God save us all from BMW dealers!!

[drz]

The auxiliary fan is expensive. They only sell the whole assembly. I think it is more expensive than then main fan.