94 town and coutry, cooling fan wires

Discussion in 'General Motoring' started by Pdigmking, Jul 23, 2005.

  1. Pdigmking

    Pdigmking Guest

    OK, so I'm trying to fix this overheating issue I have on my town and
    country van. I may have to replace the cooling fan. Strange thing, the
    cooling fan has four wires conected to the motor instead of two. Does
    anyone know why there's more than two wires and what they all do?

    TIA

    Paul
     
    Pdigmking, Jul 23, 2005
    #1
  2. The extra two wires are to prevent people like you from using a fan
    you bought 10 years ago for a different car and have sitting on a shelf. ;-)

    Seriously, it's probably for a sensor that tells the car computer how
    fast the fan is turning.

    Ted
     
    Ted Mittelstaedt, Jul 23, 2005
    #2
  3. Pdigmking

    maxpower Guest

    Its a 2 speed radiator fan motor with a high and low speed relay
     
    maxpower, Jul 24, 2005
    #3
  4. Pdigmking

    techdrive Guest

    Hi Paul,
    I've been through this with my '94 Grand Caravan and know all about it.
    Max is right about the 2 speeds. The four wires are: low speed ground,
    high speed ground, Low speed 12 volts and high speed 12 volts. A single
    speed motor won't move enough air so forget that option. The way the 4
    wire motor works is that there are 4 brushes on the commutator of the
    motor. When the cooling demand is low, the computer will enngage the low
    fan relay only. The low speed ground of the fan is permanetly connected to
    the negative, chassis ground of the van and the fan will then run at low
    speed. When you switch on the A/C or the engine needs more cooling the 2
    High fan relays engage connecting the high speed ground wire to ground and
    the high speed 12 volt wire to 12 volts. At this point all 4 wires/brushes
    are in use and the fan runs at high speed. When the brushes of the motor
    wear down, which is common, the motor starts shorting out as the springs
    and brush wires fry the commutator. Low and or Hi fan fuses will blow in
    the fuse/relay center under the hood. I priced the fan at the dealer- 350
    Bucks!! In my opinion, robbery!. Also you can't get just the motor from
    the dealer, just the whole assembly. I didn't bother with the junkyard
    route, as what they have will have some, if not alot, of wear on the
    brushes. I tried a single speed motor, which didn't move enough air even
    though the manufacturer claimed it moves enough air to sub for an engine
    mounted fan on a Chevy 350 V8. I ended up at autozone and spent $65 for an
    aftermarket 4 wire motor which is manufactured by Siemens for these
    vehicles. It is fantastic and appears to be better built than the original
    from Chrysler. That was 3 years ago with never a problem since. Hope it
    helps you out, Mike
    P.S. The motor will bolt right into your factory shroud and please note,
    the threads on the nut which attaches the fan blade are left hand.
     
    techdrive, Aug 1, 2005
    #4
  5. Pdigmking

    maxpower Guest

    Well done....are you looking for a job?
     
    maxpower, Aug 1, 2005
    #5
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