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Thread: Aux fan howling

  1. #1
    Active Member Two Rings
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    Apr 07 2012
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    Scotch Plains, NJ 07076

    Aux fan howling

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    Searched and searched but found mostly AC related problems so here it goes.....

    Upon starting my '01 1.8tqm if the heat is on auto there is a loud screaming if it is cold out or grinding noise (metal on metal). As the winter has progressed it doesn't male the screaming noise as much mainly the grinding. After a couple mins it goes away but it always happens if the heat is on when started. If I turn it off the noise stops. After opening the hood it looks to be the aux fan that is making the noise. Now the aux fan always seems to come right on. I thought it was something that kicked on when needed. After searching I found a lot of AC related problems with the aux fan but in the summer when my AC is on it doesn't make the grinding or screaming noise it just always seems to be on no matter what and sounds like a jet engine. So what is the problem and what needs to be replaced is it as simple as a fan replacement or do I need resistors and switches ect.


    Greatly appreciated

  2. #2
    Senior Member Three Rings Artiemas's Avatar
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    May 30 2012
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    North Branford, CT

    I'm a tad confused - is it the AC fan, or the aux fan?
    1998.5 Cactus Green A4
    30v AHAQM Bone stock

  3. #3
    Active Member Two Rings
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    I'm the one that is confused I assure you. I don't know much about this aspect of cars. After opening the hood and looking down it is the fan to the left on the radiator. I guess my fan that's always on with the AC is a different one all together? Not really sure. Ask me to change brakes, oil, filters ect.or put on an exhaust I got it but when it comes to this stuff I'm lost

  4. #4
    Veteran Member Four Rings Seerlah's Avatar
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    Dec 05 2007
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    A place between here and there

    You mean to the left when sitting inside the car? If so, that is your radiator fan and is always spinning because it is belt driven by your accessory serpentine belt. The other fan is electronically activated. The one that is on the right when looking at it from a view from sitting inside your car. Are you certain that it is coming from your belt driven radiator fan and not something like your power steering pump? They are right next to each others.
    I hate it when my car acts like a little bitch, treating me like a bitch

  5. #5
    Active Member Two Rings
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    No i meant left as if you we're under the hood looking straight down. If I was sitting in the drivers seat it would be the right one. Electrically operated because as soon as I turn the heat off one second later noises stop.

  6. #6
    Active Member Two Rings
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    I'm going to take a video tomorrow for you guys to show you so long as I don't total my car drifting around in all this snow tonight. God I love quattro

  7. #7
    Veteran Member Four Rings Seerlah's Avatar
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    Dec 05 2007
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    A place between here and there

    That fan is 100% mechanical. I'm not quite understanding how the heater on would make the noise disappear.
    I hate it when my car acts like a little bitch, treating me like a bitch

  8. #8
    Veteran Member Four Rings
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    Nov 07 2010
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    South of Heaven

    There is only one left and one right in a car, the left side of the car is where you drive it from in North America just to make things clear. If the AC compressor is turned on then the electric fan on the right side of the car will turn on. There isn't much to it, it basically works or it doesn't as long as it is good. I would first unplug the fan and then start the car and make sure you have the climate control set to where it would make noise and see what happens. If it is quite then you will most likely have to replace the fan motor because I don't think they are serviceable. If you turn on the recirculating mode then the AC will turn off the fan but you can't use the auto mode because it uses AC.
    - 2000 Audi A4 QTM
    - 1994 Corrado VR6
    - 1991 Jetta G60 Coupe Syncro

  9. #9
    Veteran Member Four Rings Seerlah's Avatar
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    A place between here and there

    ^Whoops. My last post I was thinking he meant the belt driven fan.
    I hate it when my car acts like a little bitch, treating me like a bitch

  10. #10
    Active Member Two Rings
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    Jul 26 2009
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    Milwaukee WI

    Mine is doing a similar thing, just have been too busy to change mine. The electric fan comes on anytime you are using AC. If you hit the "ECON" button on the climate control, it will turn off the AC and the electric fan. Mine is making a honking/resonanting sound.

  11. #11
    Active Member Two Rings
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    Yea sounds like and old car horn. Why does mine do it when the heat is on?

  12. #12
    Veteran Member Four Rings
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    I actually answered your question but maybe I added too many words, lets try it in point form

    Problem:
    - You set the climate control to auto
    - When climate control is set to Auto it turns the AC on
    - When the AC is on the secondary electric fan turns on
    - The secondary fan sounds like it is sacked so it makes noise when the AC is on

    Diagnostic:
    - Unplug secondary fan and turn climate control to auto and see if the noise is still there
    - If the noise is not there it is most likely the fan
    - If the noise is still there the it is most likely the ac clutch or the ac compressor front bearing or it could be the ac belt tensioner
    - 2000 Audi A4 QTM
    - 1994 Corrado VR6
    - 1991 Jetta G60 Coupe Syncro

  13. #13
    Active Member Two Rings
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    Thank you

  14. #14
    Senior Member Two Rings
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    Dec 12 2012
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    Niagara Falls

    Quote Originally Posted by Corrado_Guy View Post
    I actually answered your question but maybe I added too many words, lets try it in point form
    LMAO



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