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Well, your fan switch seems to be faulty, and its time to change it.
Also, I suggest you try and clean out the crap that builds up between the radiator and the support. Improving flow to the radiator makes a big difference.
Turning on the heater helps cooling because now there is more coolant going around helping remove heat.
Turning on the AC automaticly turns on the fan due to load put on the engine when the AC is on.
I suggest you replace your fan switch with an aftermarket one from hypertech or something like that. Also, GM sells a 170* stat that you can pick up at any GM dealership's parts room, and its cheaper then the ones you get out of Jegs or Summit.
Third Gens are known for the overheating. I had a 170 stat, and cleaned the crap infront of the radiator, and it stays at a nice 220, and then I am still scared.
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2/20/2013: They Day the ****s Stopped
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