I'm new to the forum board and I did a search for this problem but didn't come up with anything. I have a 98 GT GP. Recently I noticed that the car's temp was above normal when sitting (260 deg). Never had the temp that high before even on the hottest days and it's winter now. Checked the coolant and it was low. Filled it back up and things were fine. Run the car for awhile, the level drops and the temp goes up. There is a new thermostat in. No visible leaks on the ground underneath. I'm thinking bad head gasket? Anyone have the same problem ?