The car (a SEAT people carrier) heats on a long, not very steep hill, or on a gradual pull
Water pump and thermostat have been changed and the radiator has been checked.
Our car has been over heating, what could be wrong?
You should analyze instead of changing parts. It's cheaper that way.
Does the fan turn on when it get hot?
Is it holding coolant, or is the coolant leaking out somewhere?