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Both coolant fans on w/ key A/C off?

Discussion in 'VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum' started by boot, Jul 15, 2012.

  1. boot

    boot New Member

    May 15, 2011
    jetta tdi mt 03
    stock so far
    hey Gang, Anybody got an answer to this one ??? new main fan, new FCM .Also tried disconnecting the A/C
    HP switch as well as the Rad temp switch.... and then batt. neg . to clear ECM.......? :annoyed
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  2. almir

    almir Member

    Feb 6, 2011
    2005 jetta tdi gls 1.9
    If the temperature is high outside it's normal for fans to run minute or two after the hot engine is turned off. There is thermo switch which gives power to fans if the temperature is over certain limit, once the fans cool off the coolant under that limit thermo switch will open and fans will stop.

    If fans don't stop after 2 min then your fans are shorted to positive or fcm is bad

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