The fans are actuated by a temp switch that tells the computer that engine temp. From there, power is sent to a relay which turns the fans on.
The first thing I would recommend trying is to rin a wire directly from the battery to the fans to see if they will work. If they do, then we know the motors are good. Also, check in the power distribution box for the fan relay. See if there is another relay with the same part number and switch them to see if the fans turn on then. If they do, the get a new relay. If they still don't work and you know the motors are good, then move to the temp switch (near thermostat housing). Check for damaged wires, corroded connector. If all is good, replace the switch.
Let me know what you find.
Wednesday, December 16th, 2009 AT 8:25 AM