The car gets hot while running, although it never gets into the red it gets way up there. We changed out the thermostat, and it is still happening. Any ideas? Even when the car is hot, it doesn't smell of antifreeze and there are not visible leaks or puddling under the car while running or off. It doesn't seem to be pulling any coolant from the overflow, I don't know if this is a problem. The overflow is just as full when the car is running as it is when the car is off. Any help is appreciated.