I have a 1997 saturn that the fan will no come on by itself i have to turn the ac on for the fan to come on there is nothing wrong with the themostat, fan motor, and the only other thing i can think of because i can't find any thing else is the coolant temperature sending unit but the thing is the unit controllers the temp gauge that works. question is does the ctsu control the fan relay to tell the fan to come on or is there another sensor that controls that? and if there is where is it located?
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You have to thank the Gauge that shuts down your engine when hot bec. it wont knock...you have to clean your radiator and see if the coolant inside it run through the radiator holes to the engine water jacket to make sure your engine will not over heat...For the fans, find the fan relay...it's under the hood in the fuse box...
i had the same problem and the mechanic told me it was the fan motor. They replaced the motor and it stopped running hot unless I have to set in an idle mode. I turn on the AC and it stops running hot. The fan from the AC cools the motor. Hope this helps.
Are you sure it isn't in the switch itself? I believe the fan is under the hook on this car but I don't have my books here to know for sure. If you disconnect the plug to your heater motor and insert a test light inside of the plug that goes to the motor you could see if you have power there with the ignition switch on and heater blower fan switch on. The motor is about $30. to $50. but I definitely would test the motor before buying another one.
Do not let this car over heat a blown head gasket will ensue. Locate and replace the fan relay, if that doesn't fix the problem unplug fan and use jumper wires to ground the plug then feed power to the positive side of plug to check fan, if that doesn't work replace the coolant temperature sensor located somewhere near the intake manifold or thermostat housing area.
FIRST THING TO DO IS DISCONNECT THE FANS SENSOR ON THE ENGINE, THIS WILL THROW THE FAN INTO DEFAULT AND IT SHOULD COME ON, IF IT DOESN'T EITHER THE FAN MOTOR IS DEFECTIVE OR THE RELAY IS DEFECTIVE, OR BOTH, A SHORTED MOTOR WILL FRY A RELAY. DOES IT COME ON WITH THE AC TURNED ON?