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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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Old 02-12-2010, 03:57 AM   #1 (permalink)
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Post Heater switch doesn't work properly.

Hey guys I've got a problem and can't figure it out. I've got a 1990 325is, and something's wrong with my heater switch. It only blows air if I put it on "4", no air if I put it in position 0-3. Another thing, sometimes when I start the car it doesn't even blow any air on 4 either, but later I'd be driving, and it would start blowing air out of the blue. I've checked the fuses, they're all fine. But as I take it its definitely not a fuse problem. Maybe a relay?

Any ideas?
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Old 02-12-2010, 04:42 AM   #2 (permalink)
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probably the switch is worn out.....
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Old 02-12-2010, 11:55 AM   #3 (permalink)
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That's what I thought at first, so I actually changed the whole a/c, heat switch panel. The new one I put it worked perfectly fine on the car I took it off from. But I still have the same problem, that's what making me think it might be a bad relay. Is there any way to check that?
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Old 02-12-2010, 12:28 PM   #4 (permalink)
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It may be the blower fan resistor. That would explain it working only on 4 which is full on and not using the resistor.
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Old 02-15-2010, 12:53 AM   #5 (permalink)
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^^ +1

witeshark is right. it is the blower resistor!...

when that guy goes bad, it defaults into the "4" position with all other positions dead.
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Old 03-16-2010, 05:46 PM   #6 (permalink)
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Hi-I have the exact same car, 1990 325is Black, as maxa2j and with the exact same problem. Blower only works on 4, and I guess it's the resistor. Where is it located? Thanks PS: I also a Pelican member (86 911)
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Old 04-23-2012, 05:51 AM   #7 (permalink)
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Hi, Ive only just joined this board and was looking to solve the same problem - blower motor only works on position 4. I cant see anyone answering how you might be able to solve it yourself but I found this link elsewhere on the web - includes pictures of what to do. Hope it helps. I will try it and see if it works this week!

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Old 04-23-2012, 05:56 AM   #8 (permalink)
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Helps if I add the link!! Doh!

BMW E30 Network - Technical: Ventilation only works in high (4) position
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