when i was driving to work in the morning i noticed that the temperature was high so i quickly stopped at a gas station and checked if it needed radiator coolant and it did so then i bougth about a galon and i poured it all in. after that i got back in the car and started it up the temperature went down to where it should be. after i drove about a mile it starting to go up and it was heating again.so then i stopped and put the car in park and see if it would cool down but it didint and then i just drove to work and left it there im taking it to a mechanic for him to check it out on monday.i dont know if it is the thermostat or what? i hope it is the thermostat. and after a little while it runs out of coolant again which it used to take alot longer for it to run out now it is running out of coolant alot faster than b4. i am worried that if the coolant is leacking or going into the engine i hope it is not of those.or that the pipe line is cloged. but i dont think it is that im not sure il just have to see what the mechanic says..i really do hope it is the thermostat and nothing else..what else do you guys think it could be..? well thanks again. sorry for such long thread. thx..