I have a 2002 Honda Civic LX. It is at ~112,000 miles.

I am having problems with it over-heating when I drive on the interstate at +70mph for an hour and a half. As soon as I get off the interstate and stop at a light the temp shoots up and I have to pull over and give it aprox. half an hour to cool off before driving again.

It does fine driving everywhere else; in traffic, on the highways, around town. Today I drove at 60mph for over an hour and it didn't heat up. It ONLY overheats when I get off the interstate after a long period of steady nonstop driving.

The car has a new radiator (with new cap), thermostat, sensor, and water pump. I have also had a recent timing belt change.

I have had two separate mechanics perform tests to see if it is a head gasket and both places told me that is not the problem. And both mechanics cannot get it to overheat in order to diagnose the current problem.

Any ideas or help is greatly appreciated; I have never heard of this and anyone I talk to is confused about what is going on.

 

With the engine cold, take off the radiator cap to make sure the radiator is staying completely full. Don't just check in the white plastic tank.

Typically, overheating while stopped is because the radiator fans didn't come on.

 

Both the electric fans are turning on and off properly and the radiator is holding fluid fine.

 

jump the fan switch with a paper clip for a day so it is always on and see if it happens again. if it does not happen then there is something wrong with the fan system, if not then it might be something weird but we can work from there...