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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 07-18-2011, 04:04 PM   #1
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Join Date: Jul 2011
Location: Treton NJ
Posts: 3
My Ride: 2002 330Xi
Unhappy Aux Fan help!

Hi guys, I'm having some issues getting my Aux fan going. I got a 2002 330xi and its overheating in this hot weather and I think its mainly due to the fan not coming on.

I tested the fan separately and it works fine, so the first thought it was the lower coolant sensor that goes from the fan. Replaced the sensors and the fan still not moving. I start the car, try the ac and heat trick to get the fan going and its not responding.

Any suggestions on why it might not be going on?
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Old 07-19-2011, 11:08 PM   #2
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Location: Treton NJ
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My Ride: 2002 330Xi
Really? No ideas...
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Old 07-20-2011, 07:01 AM   #3
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Join Date: Apr 2008
Location: Boston
Posts: 4,971
My Ride: 2003 325xi
Search for electric fan or e-fan threads. Best way is to try a buddy's fan. Also, it doesn't come on as consistently as you think.

I would scan codes for faulty thermostat or bleed your coolant. E-fan will throw a code too.
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Old 07-20-2011, 12:55 PM   #4
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Thanks I'll check that
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Old 08-03-2011, 06:23 PM   #5
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Curious how you tested the fan separately? I've had 2 E46's and replaced 2 Aux can bypass the control module and the fan will work, however it is probably the logic in the control module that is toast and you will have a few options as I have first hand experience:

1. Replace the fan with a new fan as the control module is part of the fan. $300
2. Do the same as #1 with a bone yard fan....$100
3. Bypass the broken control module with a trigger switch that you can manually turn on when car is getting hot. $ 0.50
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