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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sat, Jul-05-2008, 11:33:29 PM   #1
kajtek123
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Default faulty motor blower or resistor?

Today the air suddenly stopped coming out of vents. all the lights on the digital unit were on and responding but no air. after few minutes the air starts coming out again for few seconds/a minute and then dies again. after i press the a/c button when the air is coming out, it suddenly dies. also, the air only comes out at one speed no matter what adjuster says.

any input appreciated
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Old Thu, Jul-10-2008, 08:25:21 PM   #2
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Default Check your resistor first

My blower stopped working last summer, and all it ended up being was a loose final stage resistor. I tightened the 2 torx bolts on it, viola, everything has been working fine since.
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Old Mon, Dec-29-2008, 01:16:58 AM   #3
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Default

i second this, my screw backed out on my stage resistor, tightened and good
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Old Mon, Dec-29-2008, 09:22:24 PM   #4
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Default

Same thing happened to me about 2 months ago, turned out to be the blower motor. Exact same symptoms.
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Old Mon, Dec-29-2008, 09:38:30 PM   #5
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Default

i'd go with resistor......sounds like teh control unit is ok as you can still adjust your settings. i've found that with a faulty resistor, you cannot do anything with the headunit. you can't turn it off, you can't select speed and you can't adjust temp
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Old Tue, Dec-30-2008, 04:02:20 AM   #6
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Default

My guess is also the resistor. That's because the fan blows at only one speed when it does operate.

I have a similar issue with my car except the blower speed matches the climate control setting when the blower runs. This is caused by a marginal terminal on the blower motor itself.
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Old Sat, Mar-14-2009, 12:26:23 AM   #7
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Default

i know this thread is a bit old, but im having these same problems...where exactly is this "stage screw" located? id like to check and see if it got loose before i go buying parts and stuff...

any help? thanks
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Old Wed, Mar-18-2009, 06:12:59 AM   #8
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Default

Here is a great DIY

http://home22.inet.tele.dk/freddy_ja...les/bmw002.htm

I took everything apart thinking it was the blower motor, but it seems to be fine. Looks more like the final stage unit, which I'm going to replace this weekend.

Same symptoms, in that the control unit works, but the fan does not operate. It has been intermittent in the past.
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Old Wed, Mar-18-2009, 02:18:39 PM   #9
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final stage unit.. where is Bigneil>
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Old Wed, Mar-18-2009, 02:49:34 PM   #10
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also going with the resistor due to only one fan speed when it does work..

same thing happened to mine
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Discussing faulty motor blower or resistor? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)