Find heater core hoses' on firewall, with engine at temp. And gloves on touch both hoses (heater on), both hoses should be hot, if so then heater core is not blocked, if only one is hot then core is blocked.
Generally, if not blocked, the heater core would leak coolant into passengers compartment. Inspect for any coolant.
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Wednesday, August 19th, 2009 AT 8:57 AM