Are you actually overheating or just the temperature gauge reading. If you're overheating could be the radiator is clogged or the water pump. If both are okay could be airlock in the system try bleeding it. Now if it continues get it blcok and pressure tested.
One way to test for a bad water pump is to squeeze the upper radiator hose when the engine is hot and idling. Careful, because the hose will be HOT! If you do not feel much coolant circulating through the hose when you rev the engine, the pump may be bad. The other cause might be a bad thermostat that is not opening properly (remove and inspect the thermostat), or a clogged radiator.
Saturday, August 1st, 2009 AT 1:18 PM