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E46 Heater fan cutting out 
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Joined: Mon May 09, 2016 9:02 am
Posts: 79
Location: Calgary
BMW: 2003 325xi
Post E46 Heater fan cutting out
I’ve owned an E46 for a few months, and it’s already proven to be higher maintenance than my E30 was.

The latest, is the blower motor for the heater. It’s cut out on me twice. The first time it repaired itself when I drove over a pot hole. This time it hasnt started working again and I’ve tried everything (hitting it, swearing at it).

The weird thing is that the heater works well (usually), the fan blows strong, no weird sounds. No signs that the motor is worn.
Where should I start? Fuses, or just rip the bastard apart?


Wed Feb 07, 2018 9:29 pm
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Joined: Tue Mar 29, 2011 6:47 pm
Posts: 1218
Location: North Calgary
BMW: 2008 335xi
2003 M3
Post Re: E46 Heater fan cutting out
Check your fuse first. If that's OK, my guess would be the final stage resistor. This seems to be a common failure point. If you're ambitious, you can look for loose connectors at the back of the heater controls or at the blower motor.

Where did you hit it ti try and get it to work? My E46 M3 heater motor is buried behind the fresh air housing and a metal plate on the firewall.

Check out this thread. http://www.bimmerfest.com/forums/showthread.php?t=143393&page=5

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Rick


Thu Feb 08, 2018 12:45 am
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Joined: Mon Apr 07, 2008 9:48 am
Posts: 374
Post Re: E46 Heater fan cutting out
Sounds like resistor, really common on the e46. If needed, I have a spare one laying around in the garage


Thu Feb 08, 2018 9:04 am
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Joined: Mon May 09, 2016 9:02 am
Posts: 79
Location: Calgary
BMW: 2003 325xi
Post Re: E46 Heater fan cutting out
Thanks guys, I checked the fuse last night all good. I ordered a Final Stage Resistor last night. After a bit more reading that sounds like the exact issue.

Where did I hit it? Just slapped the dash a couple times, which from my experience did wonders in the E30!


Thu Feb 08, 2018 9:15 am
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pt n00b
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Joined: Wed Mar 29, 2017 1:20 am
Posts: 9
Location: Calgary
BMW: 2006 E46 M3 Coupe
Post Re: E46 Heater fan cutting out
I just did this job on mine too. The resister was cheap enough but getting the last of the screws into the unit after I swapped it was murder as I had to get underneath while trying to keep this screw from falling off my screwdriver. Finally I taped it to the screw driver and got it. But I'm a big guy and that is a tight space. Make sure you check out youtube for some detailed instructions. Helped me big time.


Mon May 28, 2018 10:03 pm
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Joined: Mon May 09, 2016 9:02 am
Posts: 79
Location: Calgary
BMW: 2003 325xi
Post Re: E46 Heater fan cutting out
Oh bud, its such a pain in the ass to do! I think my neck was sore for a week after I finished it.


Sat Jun 30, 2018 10:15 pm
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