My VX engine temperature gets hot when I climb steep hills at a slow speed on very hot days. It stays cool when I am on the highways and when idling.

When climbing steep hills and turning on the heater; that is enough to keep the engine cool.

The engine has plenty of oil and coolent and runs great.

I cleaned the bugs off of the radiator coils to see if this makes a difference, but do not feel confident that it will make much of a difference.

Any suggestions?

Thanks!