ok here goes nothing been trying to figure this out for about a few months now cant figure it out . have a 2002 2.2 ohv. coupe if it matters. anyway any time i put the heat on full blast it wants to overheat and would probably do it too if i dont run it between 2000-2500 or higher on full heat. it makes no sense to me at all i have flushed it twice and still has the problem . No idea whats happening to it besides a clog or air in the lines and i just got done replacing the water pump over winter of all seasons. so if anyone has encountered this before i would greatly appreciate the info so i can fix this.