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The switch is the thing on the dash with the knobs about 220 dollars. The switch(resistor) that controls the fan speed is under the dash on the far right under by the fan 20 dollars. I would check that power is getting to the fan or unplug and run jumper wires to the fan if it doesn't turn on the fan is bad 40 dollars. There is a blower motor relay under the hood in the black box by the battery or on the passenger side looking in the top it will tell you what relay and fuse is for what circuit. Sometimes they put a spare in there marked spare if not use an identical one from another circuit 14 dollars. If this helps please rate it thanks
Hello June. In behind the radiator there is an electric fan designed to come on when the coolant reaches a certain temperature. At low speeds such as in traffic there is little airflow through the rad, but at highway speed it greatly increases the airflow. So I suspect that the fan isn't working on your car. This could be a bad fan motor, a bad fuse, a bad sensor or a wiring problem. Also check that something hasn't fallen into the fan and jammed it up.
The electrical contacts in position 1 and 2 of the fan speed control switch have worn out, go to your favorite Chevrolet dealer and order a new fan speed control switch, get it from the dealer so that you know you are getting true GM OEM parts not an aftermarket part that won't have the GM quality, it may cost a little more but you will be ahead in the long run. Good luck !
Better make sure the fan works. There is a switch on the radiator that turns the fan on when it gets to a certain temperature. It could be the fan or the switch. Your thermostat is not your cap, it's in a different location. (Usually at the engine end of the upper radiator hose) Get the leak check! A good garage can pressure test the system to see what leaks you might have.
you better test these two switches to be sure they are bad, as well as the motor. if you have an old battery that is sufficient to operate the motor alone for testing. test each switch with a continuity tester --- if they are both bad you probably have a wiring problem --- make sure there is nothing binding the window mechanism.
Check all fuses using a test light. If good, turn on fan and check for power at the blower motor connector. There all the wires there as each one is for different speed. If good, blower might be bad. If no power, check switch itself for continuity. Keep me informed.