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3 series automatic air conditioning

Discussion in 'E46 (1999-2006)' started by phildonadio, Sep 5, 2014.

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    Blower motor does not run. I checked the motor and it runs with 12 volts applied. Input wires to motor seem to have 0 volts. This system does not seem to have a resistor to vary the voltage to the motor. Does anyone have a wiring diagram or know where the controller for the motor is?
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    Actually, no - looks like that only has etm's thru E36's & Z3's up to '99, & later car's owner's manuals.

    You can look your car up at realoem.com for a parts diagram, might answer the resistor question.

    I'm not having any luck googling up any E46 etm - found a manual, not sure I'd trust the site or d-load though. (http://www.ulozto.net/xLHyZqPh/bmw-3-series-service-manual-e46-pdf )

    Russian site, not sure if that's of much help - click a link & you d-load a .pdf

    There's a few things on youtube...

    https://www.youtube.com/results?search_query=bmw e46 blower

    You might want to search bimmerforums.com, bimmerfest.com, also E46fanatics.com (which is first grouping of google results, as per below search)

    https://www.google.com/?gws_rd=ssl#q=bmw e46 blower motor not working

    I will add that it generally looks like BMW has been using the same blower-motor design going back to the 70's, if not further. The blower fan shafts spin in/through two metal-sleeve bushings; over time, the spinning shafts wear through the bushings - the first sign of this is an intermittent squeaking when the blower is on. The squeak is the blower motor spinning rotor starting to rub/contact the stator body surrounding it. This only gets worse over time, with louder squeaking and eventually the blower burns through the bushing supports to where it won't spin at all. If the bushings are badly worn, you can move the fan blade shafts around a bit manually. A quick look at a couple of the posts googled up, it looks like the E46 fsr (final stage resistor) may not be robust enough to tolerate the increased electrical load put on it by a failing blower motor, and the fsr burns out. If you find you have a blown fsr, double-check your blower motor as it may be a candidate for replacement also. I'm thinking 150k miles (generally) & upwards is likely when a blower motor will have seen enough use to be showing such signs of wear.
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    Your vehicle does have a blower motor resistor it is located under the passengers kick panel on the left hand side in the HVAC housing toward the firewall. These go bad all the time on the E46 and have a updated part. Hope this helps.

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