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  1. #1
    Veteran Member Four Rings ConroeS4's Avatar
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    Oct 27 2008
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    34656
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    Montgomery TX

    Radiator cooling fan staying on

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    Well my parents came and got me up this morning saying my radiator cooling fan is staying on. It comes on at low speed, idles, revs up to high speed, then goes back down to low speed, then shut off. It's been doing this intermittently and stays on for a minute or two. The car hasn't been driven in over 9 hours, and it's 75 degrees here and wet with no sun. I also started the car and shut it off and it's still doing this. Any idea what's wrong?
    Thanks
    Cameron
    Last edited by ConroeS4; 07-31-2009 at 08:22 AM.
    2001.5 Audi S4 2.7T 6spd Santorin Avant
    Stage 2+

    ABT tuning, Milltek exhaust, SSAC downpipes, JHM short shifter, RS4 grill, All silicone hoses, Michelin Pilot Sport A/S Plus's, 034 street motor and snub mounts, Darintake, 12" Alpine Type R
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  2. #2
    Veteran Member Four Rings 500HPS5's Avatar
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    Jul 04 2004
    AZ Member #
    2688
    My Garage
    OG B6 A4, B8.5 S5, C7 S6
    Location
    OC

    Re: Radiator cooling fan staying on

    It is the FMIC

  3. #3
    Veteran Member Four Rings ConroeS4's Avatar
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    Oct 27 2008
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    Montgomery TX

    Re: Radiator cooling fan staying on

    say what?
    2001.5 Audi S4 2.7T 6spd Santorin Avant
    Stage 2+

    ABT tuning, Milltek exhaust, SSAC downpipes, JHM short shifter, RS4 grill, All silicone hoses, Michelin Pilot Sport A/S Plus's, 034 street motor and snub mounts, Darintake, 12" Alpine Type R
    www.TexasAudiGroup.com

  4. #4
    Veteran Member Four Rings gtsingh91's Avatar
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    Sep 27 2008
    AZ Member #
    33512
    My Garage
    2005 A4 1.8TQM, 2000 S4 2.7TTQM
    Location
    Long Island

    Re: Radiator cooling fan staying on

    same thing happened to my cousins 2005 A8 and he replaced the thermostat, water pump, and timing all at the same time, but i think the culprit was the thermostat
    Instagram: @vishi_s4
    2005 Audi A4 1.8T Quattro - 6-Speed - Revo Stage II+ - Light Silver Metallic

    2000 Audi S4 2.7TT 6 Speed - EPL Stage II - Hibiscus Red Pearl

  5. #5
    Veteran Member Four Rings Mark's Avatar
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    Feb 11 2004
    AZ Member #
    60
    My Garage
    1959 MGA 1600
    Location
    Chocolate Land, USA

    Re: Radiator cooling fan staying on

    might have water in the ecu or the radiator fan control unit is bad or has water in it. could be coolant sensor as well.
    -Mark

    1987 5000 CS TQ 2.2T I5 - No more . . .
    2002 Denim Blue A4 1.8TQMS - RIP
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  6. #6
    Veteran Member Four Rings JEENYUS's Avatar
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    Jul 28 2009
    AZ Member #
    45627
    My Garage
    2003 A4 3.0 V6
    Location
    SL,UT

    Re: Radiator cooling fan staying on

    if you look on the front of your car (under the hood) it states:

    CAUTION! RADIATOR FAN MAY TURN ON AT ANYTIME. KEEP HANDS CLEAR!

    it reads more or less as that. I would talk to the dealer and see why, it might just be hot as hell. I would check that out and see. sometimes the car just does that to cool off.

  7. #7
    Veteran Member Four Rings JEENYUS's Avatar
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    Jul 28 2009
    AZ Member #
    45627
    My Garage
    2003 A4 3.0 V6
    Location
    SL,UT

    Re: Radiator cooling fan staying on

    OBS: i doubt that it is water, it gets so hot and these car (well at least mine) can handle a lot of water before anything ever happens...


    <<<<proof of this

  8. #8
    Active Member Two Rings FLultrasport's Avatar
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    May 10 2009
    AZ Member #
    42306
    My Garage
    2004 A4 1.8T
    Location
    columbia, south carolina

    Re: Radiator cooling fan staying on

    i had the same thing hppen to me you might want to disconnect your battery before it kills it, i took it into the dealer and they said the engine coolant temp sensor was broken so the car thought the engine was over heating even tho it wasnt on, luckily i had a warrenty on it so i didnt have to pay that much but i dunno what it will be like for

  9. #9
    Veteran Member Four Rings 500HPS5's Avatar
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    Jul 04 2004
    AZ Member #
    2688
    My Garage
    OG B6 A4, B8.5 S5, C7 S6
    Location
    OC

    Re: Radiator cooling fan staying on

    On the real it is the green coolant temp sensor, about $16 to fix.

  10. #10
    Active Member Two Rings FLultrasport's Avatar
    Join Date
    May 10 2009
    AZ Member #
    42306
    My Garage
    2004 A4 1.8T
    Location
    columbia, south carolina

    Re: Radiator cooling fan staying on

    they swapped out a few parts tho i think i dont know what all is involved with it

  11. #11
    Veteran Member Four Rings mtbrider's Avatar
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    Oct 31 2005
    AZ Member #
    8581
    Location
    Virginia

    Re: Radiator cooling fan staying on

    Quote Originally Posted by 400HPA4 View Post
    On the real it is the green coolant temp sensor, about $16 to fix.
    I second this..
    Daytona Grey Pearl R8, not that fast but you'll hear me before you see me!
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  12. #12
    Veteran Member Four Rings diagnosticator's Avatar
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    Aug 26 2005
    AZ Member #
    7741
    Location
    Seattle, WA

    Re: Radiator cooling fan staying on

    This is a common symptom of water in the ECU compartment. You should remove the cover and visually check for water inside, doing so will either rule out the possibility, or reveal the cause of the fan running erratically with a cold engine and the ignition OFF.

  13. #13
    Veteran Member Four Rings ConroeS4's Avatar
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    Oct 27 2008
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    Montgomery TX

    Re: Radiator cooling fan staying on

    If there is water in the ecu how bad is that?
    2001.5 Audi S4 2.7T 6spd Santorin Avant
    Stage 2+

    ABT tuning, Milltek exhaust, SSAC downpipes, JHM short shifter, RS4 grill, All silicone hoses, Michelin Pilot Sport A/S Plus's, 034 street motor and snub mounts, Darintake, 12" Alpine Type R
    www.TexasAudiGroup.com

  14. #14
    Veteran Member Four Rings diagnosticator's Avatar
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    Aug 26 2005
    AZ Member #
    7741
    Location
    Seattle, WA

    Re: Radiator cooling fan staying on

    Quote Originally Posted by ConroeA4 View Post
    If there is water in the ecu how bad is that?

    If visual inspection confirms water inside the ECU box, it depends on how much water and how long it has been leaking into the ecu compartment. The parts typically damaged are the several relays and fuses inside. The engine ECU itself is high enough, above the relays, to not get wet. The relays and fuses need to be replaced, and the cause for the water leak into the ECU box identified and fixed for sure.
    Last edited by diagnosticator; 07-31-2009 at 01:21 PM.

  15. #15
    Veteran Member Four Rings jackyaudi's Avatar
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    Jun 26 2007
    AZ Member #
    19082
    My Garage
    '02 A4 1.8TQS
    Location
    Montreal

    Re: Radiator cooling fan staying on

    When I removed the fuse for the radiator fans (cannot remember why at the time), the fans kept on running as long as the car was. You would think they would stop, but it was the opposite. Maybe check that fuse?
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  16. #16
    Registered Member One Ring
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    Oct 13 2012
    AZ Member #
    102174
    Location
    Humble

    Hi guys! I'm new here and new to this car stuffs.. At first I wasn't really interested with cars, it's only now that I become interested. So please be good to me. LOL Actually, I think I'm experiencing your problem now with those radiator cooling fan. I didn't know it has something to do with the thermostat. I thought of just replacing it and buying this dual cooling fan oe style for radiator. But I'm glad of all the information I got from this. Thanks! There's a lot to learn!



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