Report "My car is doing the same thing....it was running just fine then one day it just started overheating. It only takes a couple minutes and it is getting hot. But then sometimes it is wierd it will get hot and cool back down. The coolant is leaking somewhere we have to put gallons of water in it a day like every time we stop it is close to empty. We took all the hoses from the resivour to the motor off to make sure there wasnt a clog somwhere. It is starting to get very irritating. We changed the thermostat today and it is still doing the same thing.The heater also...at first it will get really hot but not for long then it gets really cold and fogs the window up. What could be our problem??"