Thread: My 1999 Mitsubishi Eclipse keeps overheating...?

It seems the thermostat is opening properly and the water pump is circulating water soo I dont understand why the car keeps getting hot.

if it,s circulating then the thermostat is opening. maybe the fan not kicking on.

is the cooling fan running when it gets hot?

Have an inexpensive cooling system pressure test done to see if you have any external or internal coolant leaks.

Any car that old which has had marginal cooling system care has a dirty cooling system and a plugged radiator which kills your cooling efficiency..

look on youtube

The circumstances make a difference - whether it gets hot when idling but cools down when you go, or heats up when you drive and just doesn't cool down, and if the heat has stopped working. My guess is it gets hot and doesn't want to cool down but the heat works. If so, that points to radiator blockage. If the radiator has had tap water added (usually to dilute antifreeze) it is very likely because it takes only a gallon or two of tap water to thoroughly plug up a modern radiator and no flush in the world will help. The test for that is to remove the hoses from the radiator and try to run water from a garden hose through the radiator. It should take all the hose can put out without backing up. The last radiator I changed out, in a friend's 2000 Focus, was so plugged with hard water deposits I could hardly blow air through it.

worst case scenario, blown head gasket, cracked head, warped head.