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Thread: Mk 4 R32 coolent fan issues

  1. #1
    Join Date
    Jan 2012
    Location
    Osborne Park WA
    Posts
    7

    Mk 4 R32 coolent fan issues

    Hi
    Fuse S164 (sits on top of battery) rated at 40 amps blew the other day.
    This fuse supplies currant for the high speed coolant fans.
    Have replaced the fuse and the fans are running correctly.
    I checked the currant consumption when the fans were running at full speed and got 38 amps.
    I was wondering if there are any M4 R32 owners in the Perth area that I could check what the currant consumption is on their car.
    It is a simple test I use a clamp on ammeter so I don’t disturb any connections - all I need to do is to remove the battery cover and I clamp the meter around the wire that runs on the top of the battery to the coolant control unit - test takes less than 2 minutes.
    If anybody can help it will be appreciated – can arrange a time and place at your convenience.
    Thanks
    John

  2. #2
    Join Date
    Jul 2009
    Location
    Geelong, Victoria
    Posts
    859
    Users Country Flag

    replied in the first post section, but also here in the mk4 one:

    it is not uncommon for this fuse to go.
    there are resistors built into each fan (to control high or low speed), and they tend to get hot and burn out over time - alternatively the fuse goes.
    If only one resistor goes it put extra load on the remaining one in the other fan.
    This tends to give AC issues - for some unknown reason the AC gets its power from the low speed side of the thermo fan...
    After a while - both resistors go - you lose both cooling fans and AC - i know because this has just happened to me - waiting for some power resistors to arrive from overseas to do a bypass mod on the fans and get it all going again.

    Alternatively you can replace your fans at $$$....
    My build thread here: 1.6 sr into 1.8T http://www.vwwatercooled.org.au/foru...-8t-63249.html

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