Is my final stage resistor going out?

Kurt V · 12-15-2010, 08:31 AM

I have a 2006 330i. Coming in to work this morning my fan would go on and off intermittently and only work on the three lowest speeds. However, if I pushed the defrost button the blower would go to the highest speed as it should. Is this an indication of the final stage resistor going bad? I replaced one when I had my E46, but did not think it to be a problem on the E90. Where is the best place to get one and is there a good DIY for it for the E90? Thanks!

fdriller9 · 12-15-2010, 11:03 AM

Your AC blower fan?

Maybe the fan is failing? It is a known problem that the windshield cowl will leak onto the AC blower and cause it to rust and fail prematurely. A wet passenger side footwell is also a symptom.

Here's the TSB:

http://www.bmwtis.com/tsb/bulletins/...p/B513305g.htm

12-15-2010, 08:31 AM	#1
Kurt V New Member 0 Rep 16 Posts Drives: 2006 330i Join Date: Jan 2010 Location: Missouri iTrader: (0)	Is my final stage resistor going out? I have a 2006 330i. Coming in to work this morning my fan would go on and off intermittently and only work on the three lowest speeds. However, if I pushed the defrost button the blower would go to the highest speed as it should. Is this an indication of the final stage resistor going bad? I replaced one when I had my E46, but did not think it to be a problem on the E90. Where is the best place to get one and is there a good DIY for it for the E90? Thanks!
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12-15-2010, 11:03 AM	#2
fdriller9 Banned 253 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	Your AC blower fan? Maybe the fan is failing? It is a known problem that the windshield cowl will leak onto the AC blower and cause it to rust and fail prematurely. A wet passenger side footwell is also a symptom. Here's the TSB: http://www.bmwtis.com/tsb/bulletins/...p/B513305g.htm
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