Ok, next thing to check. Locate the heater hoses in the engine compartment, they sould be going to the fire wall on the center passenger side. After warming engine to operating temp turn off car, carefully feel both hoses. Are both hot or is one hot and the other warm. If one is warm then you most likely have a clogged Heater Core and need to replace it. Or you can try Back Flushing it.
Purchase 2 pieces of heater hose about 3 foot long each, make sure same size as existing hoses. Remember which hose was warm. Connect the 2 new hoses to the heater core then connect a water hose to the side that was warm, just let the other hose hang under vehicle or stick end into bucket to see what comes out.
I would also suggest that you use a cooling system fush and flush out the system if the above is the problem.
If both hoses are hot the the most likely cause is the Blend Doors not operating properly.
Tuesday, January 4th, 2011 AT 3:58 PM