when my car is at idle not movin the car doent over heat but as soon as i drive off the temputure starts to go up. the top hose on the radiator gets hot and the bottom one is warm basically i can hold the bottom one with my bare hands and the top one is hot as hell. so much pressure builds up in the system that the thermostate housing blow up on me and left me on the side of the road. i took out the water pump and its spining and the cluch fan is tight. i also flushed the radiatorin case it was cloggedim out of ideas need help. plz thanks