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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 11-12-2005, 12:22 PM   #1 (permalink)
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Unhappy auxiliary fan

hi,

i have a serious problem and i seriously need help.....right after you crack from laughing...

My auxiliary fan is always on...always..even if the car is not on...i had to unplug the battery terminal to make it stop.
Did anyone have any similar problem...help wanted.
E 46 328 CI 2000.
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Old 11-12-2005, 02:46 PM   #2 (permalink)
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I'd say take a look at the fan resitor. Its mounted to the fan housing. Follow the wires from the motor to locate it.If it is a module thing you have to replace the whole fan unit because the module cant be replaced on its own.It is around $500.00 US for parts.
BTW there nothing to laugh about , it is a common problem on BMW with aux fans. It is normal question you have asked !

Last edited by zibby; 11-12-2005 at 03:51 PM.
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Old 11-13-2005, 08:11 AM   #3 (permalink)
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I think itís your rad temp sensor the DME controls the fan and if it looses it signal for the sensor it runs the fan, but the fan is permanently feed so it can run after the engine is off so itíll run all the time
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Old 11-13-2005, 02:26 PM   #4 (permalink)
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There used to be a Technical Service Bulletin/Recall on the E46 Aux fans. As mentioned in a previous post, this was/is a common issue and involves replacing the module located on the fan housing. Under the TSB, warranty covered replacing the entire fan assembly which included the module.
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