ok so im driving back to school yesterday and i cruising at about 80 when i look down and see my temp gauge at about 3/4s. i let off the gas and it went back down to normal. i did it like that all the way back to school. then im sitting in the parking lot and it just kept going up until i turned the car off. so my question is what could be wrong? i was thinking the thermostat. im gonna go today and check all the fluids and pumps and make sure im not leaking. but just wondering if anyone else has got any ideas.