Erratic heater blower - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 11-22-2003, 09:37 AM
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Hi all,

I have an E39 with an erratic heater blower problem. Has anyone had similar problems, and if so how do you fix it?

Cheers in advance.....
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#2 (permalink) Old 11-22-2003, 11:53 AM
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more specific plz

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#3 (permalink) Old 11-22-2003, 11:46 PM
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Hi alanh,

The heater blower intermitantly increases in speed, sometimes upto full power whether it's in auto or not. And I have no control over it apart from turning the blower off.
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#4 (permalink) Old 11-24-2003, 05:59 AM
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isnt that supposed to happen when you turn the climate control to 32? it keeps the car at the same temp at all times ?

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#5 (permalink) Old 11-24-2003, 09:34 PM
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Quite possibly. But this happens ant any temperature.
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#6 (permalink) Old 01-07-2004, 12:40 PM
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Hi

I have the same problem. You should be able to turn off 'auto' and reduce the blower level to the minimum without the climate control taking over as far as I know and when I do this, I get the same symptoms as you. I'm wondering whether this could just be loose connections as my fans tend to cut out for a short time when I hit a bump in the road. I'm having it serviced by a dealer in the next couple of weeks so will see if they can advise.
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#7 (permalink) Old 01-08-2004, 04:08 AM
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Cheers Nick,

Please keep me posted.
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#8 (permalink) Old 01-23-2004, 12:36 PM
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Just had the car serviced at the dealer and, as predicted by other posts on the board, it was a faulty sensor (Apparently happens quite a bit. The part was 50 + fitting so not a cheap fix, but certainly cheaper than a new climate control unit. If you need the full name of the unit, let me know and I'll dig out the docs.

Cheers
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#9 (permalink) Old 01-24-2004, 02:27 AM
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They probably replaced the blower RESISTOR/FINAL STAGE UNIT. It's not a sensor.
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