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Thread: E36 M3 A/C wonít blow over half speed... Usually.

  1. #1
    Join Date
    Aug 2015
    Location
    South Carolina
    Posts
    7
    My Cars
    1999 BMW M3 Coupe

    E36 M3 A/C wonít blow over half speed... Usually.

    Battery is new and provides correct voltage. A/C system USUALLY doesnít increase fan speed past speed 5 of the total 8 speeds. Very rarely, speeds 6-8 will work. Speeds 1-5 always work fine. A/C blows cold. Just replaced cabin filter, which I didnít expect to fix the issue, and of course it didnít.

    Any idea what the issue could be? My blower motor was being a bit squeaky at low speeds last year, so maybe thatís the problem. Could also be the Final Stage Unit? Any help is appreciated. Sorry if this has been addressed. I searched and didnít find an answer.

  2. #2
    Join Date
    Jul 2010
    Location
    Murrieta, CA
    Posts
    8,434
    My Cars
    '94 325iC, '08 328i, E93
    Final Stage Resistor.

    There's always the chance that the fan motor is gooey and dirty and simply won't go fast anymore. There's no way to know that from my side of the keyboard. I drove my E36 for something close to 20 years and NEVER turned the fan off. To be honest, I cannot remember the last time any of my cars was driven with the fan off. Never ever turn the fan off, that's my approach to life.

  3. #3
    Join Date
    Jun 2010
    Location
    NY
    Posts
    6,984
    My Cars
    1997 328i
    You can actually repair the FSU. Under the black tar stuff are soldered connections that crack, remove the old solder and put fresh. I have an old pic but can't attach it now.
    Avoid Vogtland Suspensions! Rusted then failed!

  4. #4
    Join Date
    Jul 2020
    Location
    Gloucester, VA
    Posts
    1
    My Cars
    1998 BMW 318i
    I had a similar issue, this fixed mine.

  5. #5
    Join Date
    Jun 2010
    Location
    NY
    Posts
    6,984
    My Cars
    1997 328i
    I eventually got an aftermarket FSU off ebay and while it looked OEM it worked a bit differently, the lowest speed was much higher than an OEM unit. This at first was a little annoying but i n the long run its a much better design. The OEM unit will run hot and eventually fail when run at the lowest speed because the fSU relies on that air flow to cool it down.

    Here is the one that came with my car that I repaired and it worked a while longer but eventually something else inside failed.
    Attached Images Attached Images
    Avoid Vogtland Suspensions! Rusted then failed!

  6. #6
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    47,819
    My Cars
    11/88 E32 750iL+98 E36M3
    Moved to E36 M3 forum from E36 forum
    SHOGUN'S TRICKS AND TIPS FOR THE SEVEN SERIES
    http://twrite.org/shogunnew/topmenu.html

  7. #7
    Join Date
    Jun 2005
    Location
    Vancouver, BC
    Posts
    173
    My Cars
    E36 ///M3 1999
    Quote Originally Posted by JDStrickland View Post
    Final Stage Resistor.

    There's always the chance that the fan motor is gooey and dirty and simply won't go fast anymore. There's no way to know that from my side of the keyboard. I drove my E36 for something close to 20 years and NEVER turned the fan off. To be honest, I cannot remember the last time any of my cars was driven with the fan off. Never ever turn the fan off, that's my approach to life.
    I did not even know the fan could be turned off. Yes. I never turn my fan off either.

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