Just get a new colume worked for me
SOURCE: 2001 Cavalier throttle position sensor
Look where your throttle cables etc are attached at throttle body, it should be at opposite end of the shaft that operates throttle plate in front of throttle body opening. Usually held on with Torx screws
SOURCE: 1996 chevy cavalier. problems starting and running
Actually i doubt the switch is in default here. Especially that if i'm not mistaken the theft light on those was only on the monsoon radio systems and only tells the status of the theft lock on the radio. And if the theft lock light on the radio comes on it's because it thinks it's being unplugged. Taking that in account and reading all the problem you have with the car, i'm strongly leaning toward a grounding problem. So check the negative post on the battery to be sure its not moving or broken in any way, and verify all the grounding wire and straps and replace them if needed. Not many people know this but the ground wires on a car are 100 times more important than the positive wires. Without the grounds, the current has nowhere to go on any components, so that means even the spark plugs stop sparking. If all the grounds are good, just check the battery itself and the alternator just to be sure they are not causing these problems. And if all else fails, then it would be option to change the ignition switch/cylinder. Pretty sure though that you can find one in a scrap yard for less than 150$, those cavaliers are practically raining everywhere in the scrap yards, and you can also use one from a pontiac sunfire which is the same car. Also, you can use most switches from other GMs in the same years, like a grand am, grand prix, lumina, etc. Just make sure that the car you take it from has basically the same equipment more or less than your cavalier so that the zenith has the same number of wires as yours and same positions also.
SOURCE: air condition fan switch works only in postions 3 and 4.
Sometimes these resistors are located under the passenger side dash under or behind the glove box, the resistor is located on the side of the heater box if the heater box can be found.
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SOURCE: Fan switch does not work in the 1, 2, 3, position 2006 Cobalt
You have a problem with the blower motor resistor. This is a very commen problem on all gm cars and light trucks. The part is not to pricey. You can find the resistor under the glove box buy the blower motor. Two bolts and out it comes.
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