Blower Switch Acting Up - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 02-03-2005, 08:33 PM
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Love my E30s, have two of them.

My wife drives an 86 325 sedan with 230,000 on it! Runs like a top

Recently, over the winter, the blower switch stopped working on any setting except the highest! Blower always worked fine with no strange noises or anything. She went out one morning and was letting the car warm up with the defroster on HIGH and noticed that now, any other setting on the switch is like having it turned off completely.

I've tried switching it back and forth and just playing with it in general to no effect. It ALWAYS works on the highest setting and NEVER works on any of the lower ones! This was very sudden. Nothing else is wrong with the car.

I've got a couple of chilton's and the like but thought I would post here to see if anyone had a good idea where I might start...

Thanks in advance!

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1986 535 5sp sedan, 172,000 Awesome!
1978 530 AT sedan, 275,000 still runs and drives
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#2 (permalink) Old 02-03-2005, 09:48 PM
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Quote:
Originally posted by October@Feb 3 2005, 07:33 PM
Love my E30s, have two of them.

My wife drives an 86 325 sedan with 230,000 on it! Runs like a top

Recently, over the winter, the blower switch stopped working on any setting except the highest! Blower always worked fine with no strange noises or anything. She went out one morning and was letting the car warm up with the defroster on HIGH and noticed that now, any other setting on the switch is like having it turned off completely.

I've tried switching it back and forth and just playing with it in general to no effect. It ALWAYS works on the highest setting and NEVER works on any of the lower ones! This was very sudden. Nothing else is wrong with the car.

I've got a couple of chilton's and the like but thought I would post here to see if anyone had a good idea where I might start...

Thanks in advance!
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is it working at full power on hi? or is it weaker then normal?

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#3 (permalink) Old 02-03-2005, 11:01 PM
OMFG another one!?
 
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I had this problem. The resistor unit that allows the lower setting needs replacing. Wasn't too hard but took a while

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#4 (permalink) Old 02-04-2005, 11:17 AM
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Quote:
is it working at full power on hi? or is it weaker then normal?
I'd say it's working at full power.

Where will I find this resistor unit? Behind the switch or somewhere else? I had a similar problem with a Porsche 944 and the resistor setup was on the blower housing itself.

1992 325ic *sold*
1984 320 *sold*
1986 325 5sp sedan, 175,000 Great car!
1986 535 5sp sedan, 172,000 Awesome!
1978 530 AT sedan, 275,000 still runs and drives
1997 740il AT sedan, 125,000 Like a newly wed!
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#5 (permalink) Old 02-04-2005, 12:20 PM
OMFG another one!?
 
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If I remember right it's in the dash in a weird place near the glove box, this was a while ago

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#6 (permalink) Old 02-04-2005, 01:43 PM
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its in with your blower motor im pretty sure, but that is what you need
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#7 (permalink) Old 02-04-2005, 04:32 PM
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The resistor is either inop or more likely needes a good cleaning. common problem. there is panel across the firewall-easy to remove. remove blower motor cover(2 nylon straps) and unplug resistor. clean all contact plus the thermal switch-looks like points-and should work. plug it back in and try it with the cover off as often you will have to clean 2-3 times
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#8 (permalink) Old 02-04-2005, 04:45 PM
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sweet. Nice to know someone else has had this problem. I'm going to clean my resistor tomorrow!

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#9 (permalink) Old 02-04-2005, 05:03 PM
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go ahead and replace it, they are cheap, and then you wont have to worry about it
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#10 (permalink) Old 02-15-2005, 07:06 AM
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Same problem with my 1991-11 325i bimmer. Can anyone tell me where that resistor is? used
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