thats right i put in a new thermostat and radiator . and while at first start its all good gauge right in the middle , then drive for about 3 minutes it starts to heat up . i already checked thermostat and it opens fine. NEED HELP SOON. GOTTA GET TO WORK.

 

Could it be your water pump? We had that happen to us last year.. We replaced the radiator and the thermostat and stalled on the freeway and had to try to get off the freeway in rush hour traffic just to find we had a blown water pump!