TY for the donation and Merry Christmas-Have you checked the heater core if tis clogged-up if not do so, if it continues try bleeding the system and see what happens to include checking the heater control valve if it has one
Water pump testing:
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.
Thursday, December 17th, 2009 AT 10:27 PM