E39 (2003 530) Air ducts not working - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 08-23-2007, 08:24 PM
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Angry E39 (2003 530) Air ducts not working

A/C seems to be working, because I feel the cold air slowly coming in. But w/ or w/o A/C, the air ducts seemed to have stopped working. No air from any duct whatsoever. The fan in front of the radiator (the one you see behind the grille) is working.

I tried manual speed, auto speed, A/C, Max A/C, no A/C but nothing!! When I switch from setting to setting, I hear the motor trying to make an effort to blow the air.

Any Help?

Thanks for reading.

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#2 (permalink) Old 08-24-2007, 06:47 PM
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Blower motor resistor, a.k.a. final stage resistor has probably gone bad. Other issues when this goes bad is the interior fan will turn itself on and off, the blower speed will surge up and down, and the blower can stay on even if the car is turned off and the key is out of the ignition.
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#3 (permalink) Old 08-25-2007, 02:56 AM
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Update: It seems to be working now on its own. I wonder if heat and humidity was a factor in messing it up.

Is there a way to check the final stage resistor? Any idea how to get to it?

Thanks for your reply .



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Originally Posted by BMWJNKY
Blower motor resistor, a.k.a. final stage resistor has probably gone bad. Other issues when this goes bad is the interior fan will turn itself on and off, the blower speed will surge up and down, and the blower can stay on even if the car is turned off and the key is out of the ignition.

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#4 (permalink) Old 08-27-2007, 10:55 AM
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Quote:
Originally Posted by TheHire
Update: It seems to be working now on its own. I wonder if heat and humidity was a factor in messing it up.

Is there a way to check the final stage resistor? Any idea how to get to it?

Thanks for your reply .
Sounds like it is the blower motor resistor because the fan is working now. Eventually the resistor will die, its somewhere in the passenger foot well area under the dash. I'm sure there are DIY's out there on how to change it since it is a common problem.
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