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Re: 2004 Chevy Classic fan problem
There will likely be what is called a blower motor resistor or module that is mounted in the side of the blower housing. sometimes you access them from the engine compartment but I think yours is up under the dash on the passenger side. It is about 1 inch wide and 2 inches long, probably held into the housing with two screws. It will have a heavy wired connector going to it. Disconnect it, remove it and replace it with the updated unit.
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CHECK WHETHER THE COOLANT IS PROPERLY CIRCULATING.ALSO CHECK WHETHER THE RADIATER PIPES ARE NOT CLOGGED.ITS ALWAYS BETTER TO USE DISTILLED WATER RATHER THAN NORMAL WATER WHILE MIXING IT WITH COOLANT. ALSO CHECK THE TEMPERATURE SWITCH ATTACHED TO THE RADIATER. A FAULTY RADIATOR CAN STOP THE FANS FROM COOLING.
It sounds like the front window has a bad window switch. Removing the switch panel is usually not that difficult. Look for a pry slot usually located at the back of the panel. Insert a small flat blade screwdriver and pry up on the panel. The switch panel should come out of the door panel. Next, locate the wiring harness for that switch. The switch panel can be tested as follows : 1. Connect a test light to one side of the harness and operate the window. 2. Do the same thing for the other side of the harness. If the light comes on in one direction but not in the other, then the most likely cause is a faulty switch panel. Perform the same procedure for the rear window. If it lights in both directions, then the most likely cause is a bad window motor. If that is what it appears to be, then I can tell you how to test the window motor before replacing. Just give me a response back if you need to. I hope this information has been helpful and thank you for using Fixya.com.
I believe the socket size is 3/16 or 1/4. Most of the time you can use a multitip screw driver without the tip installed. This is not a true 1/4 socket size but works for most bolts like this. As far as the overheating issue there is a fan relay along with a thermostat switch. Most people bypass the relay and switch and just direct wire the fans to the ignition. This will make you car run colder but that is not always a good thing. Some engines do not run correctly if the temperature is too low.
More then likely the switch itself is bad. Chances are the contacts inside the switch are not connecting and allowing the motor to operate in those positions. If possible, try a known good switch in it's place.