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Thread: Fixed my heater fan

  1. #1 Fixed my heater fan 
    club member Club Member Patrick's Avatar
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    Nov 2011
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    354
    For a number of years now the heater has caused problems with the fans moving out on the shaft and scraping against the side of the outer casing. The tick tick scraping noise can be heard even with the exhaust on the louder setting.

    It’s finally time to fix it properly.

    Step 1, spend a few hours swearing at hard to get to bolts to get the outer casing off and the wiring disconnected.



    Here’s the culprit – right next to where it’s supposed to be stuck to.



    It moves out here and scrapes on the case.



    Decided to use a few different methods, first drill a 2.4mm hole down the end of the shaft.



    Tap the hole using set of M3 taps.



    Test fit (this is a super long bolt, use a much shorter one)



    Added a number of washers



    This will stop the fan from moving off the end of the shaft.



    Then to add a bit more security roughed up the motor shaft and the inside of the fan, then used some epoxy to keep the fan on, and the washer on and the bolt in place.



    Reassembled the whole lot:



    Put a fresh connector on for the earth (had to cut that to get fan off the car, with the scuttle panel in place it’s hard to get to some of the wiring).



    Re-arranged the wires, new connector for the earth and zip tied everything back up.



    Heater snapped back together, bolts put in and the 6 metal clips back on. Used tape to seal the front panel and connected up the window de-misters.



    Re-installed the headunit



    And now it’s back to looking like nothing happened.



    On the plus side I can use the heater again without it being super irritating!
    BMW E30 Sportster 2005 - M20B28 - Build Log and Updates http://www.msportster.co.uk/
    http://www.modelog.co.uk/
    http://www.mustang67.co.uk/
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  2. #2 Re: Fixed my heater fan 
    club member Club Member
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    Jun 2015
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    Kelsall Chester
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    Lovely job Patrick. If you are really cold the noise of the heater wouldn't matter! Did you do the other side before it comes loose? I assume the fans were just a push fit. A solution I have used on bilge pumps was to machine a groove on the end of the shaft by holding a hacksaw against the spinning shaft and using a circlip and Loctite.
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  3. #3 Re: Fixed my heater fan 
    club member Club Member Patrick's Avatar
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    Nov 2011
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    354
    Thanks Circlip, that's an excellent solution. Will keep that in mind if it comes loose again. Yeah I did the other side too, I really didn't want to have to extract the heater again any time soon.
    BMW E30 Sportster 2005 - M20B28 - Build Log and Updates http://www.msportster.co.uk/
    http://www.modelog.co.uk/
    http://www.mustang67.co.uk/
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