I have the same problem with mine. I have only 55,400 miles on it but it sat for about 4 years. It has a new top radiator hose and new thermostat. The cooling system seems tight. I did notice that the right side radiator fan comes on at regular intervals even when the thermostat is closed. The left fan doesn't come on at all, even when it overheats.
When the car is left in park and the engine idles for about 30 to 45 minutes, the temp gauge will read about 3/4. When I put it in gear it overheats within 1 minute and coolant leaves through the 18 psi cap (through the overflow hose).
Could it be the fan relay? Fan? Some sort of 2nd stage temp sensor?
BTW, great site here. I will be surfing it for a long time.
Wednesday, November 19th, 2008 AT 5:25 PM