Join Date: Nov 2007
Location: Corpus Christi, TX
The system is fused. If the fuse is good, check the fan switch (coolant sensor). It's at the bottom of the radiator. Pull the wire and with the ignition on ground the wire. If the fan comes on, it's the sensor.
If the fan doesn't come on, check that there's voltage present at the sensor when the ignition is on. If there is no voltage, then check the relay. There should be juice from the battery to the relay. If there is and there is no current at the sensor wire (with the ign on) then the relay is suspect. With the sensor wire grounded, check for juice at the output to the fan motor (or in the fan motor harness). If no current, then the relay is probably it. If the relay is passing current thru, then it's most llikely the fan motor.
Everything except the sensor is pretty much under the tank. Good reason to start with the sensor (fan switch).
Start slow. Do it in steps. And think.
Last edited by BIGIRON; 06-17-2008 at 11:04 AM.