Most all the comments made here are correct about thermostat operation and I would like to add some other insights. The radiator fans on C-4s and C-5s don't come on while sitting still until over 230 degrees. There is a reason for this. The Radiator fans take a bunch of power to operate. Just listen to the alternator whine when the fans come on! This also takes power away from the engine to turn the alternator with those high amp fans running. The object is to keep the fans OFF until absolutely necessary! This saves fuel, adds power, and saves the alternator and the radiator fan motors. These Engineers are not as dumb as some might think. I had a person call last week wanting to turn the fans on quicker to cool his engine down as he said "It just runs too hot and it just won't last running that hot" I asked how many miles he had on the car and he said "Over 200,000 miles".
Keep another thing in mind, when the air conditioner is on, it also turns the radiator fans on and a properly operating Corvette with electric radiator fans will actually run cooler in traffic than with the air off.
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