Ok so I first realized that my cars heater was not working unless I went past a certain speed and then today after driving on the highway, I came off to turn on my street and my thermostat shot up to H and I had to turn off my car to cool down. I only turned it off for like two minutes before turning it on and it going back to normal. What could it be?
It is a 2002 nissan altima with about 132000 miles on it.