Iwas driving on the highway, cruising at 80mph, and noticed the temp guage rose towards the red. I slowed to 65mph and put the heat on. when i did this the temp subsided and i noticed a loud tapping, like a constant tapping of a pen on the intake plenum. when i put my foot to the clutch, the car stalled out and refused to start.the next day it started but continued this noise. what could it be.