Question about 2003 Chevrolet Cavalier

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The blower motor in our 2003 Chev Cavalier is working only when it wants to. What can be wrong?

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Sometimes one or other of the carbon brushes gets stuck so that contact with the motor armature is episodic. You may experience that the motor comes on when you turn in one direction and off again when you turn in the opposite direction. This is due to a small amount of play in the motor bearings and the transfer of weight as the car makes the turn allows the motor core to make or brake contact. Simply remove the motor and free up the carbon brushes. If the brushes are particularly worn down just replace them and then refit the motor which should then last the life of the car.

Posted on Aug 20, 2010

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Heater fan not working on my 2003 cavalier


From your symptoms I would suggest, inspect the Climate Control and the Blower Motor Resister. Locate and remove the resister and test. You are looking for power at the plug (going to the resister). One wire will always be hot (with the ignition key on). The other four wires are ground wires that through the resister, changes the blowers speed. Connect a test-light to 12volts positive, test that the test-light is working, and then start testing for ground. Unplug the resister and test at the plug. With the ignition key on, test each wire. Each wire should light up your test-light depending on the position of the speed control knob. If it passes then plug the resister back in and probe at the blower motor. The blower motor needs both ground and power to run. Find out which is missing and write back. Good luck.

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1 Answer

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1 Answer

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