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My experience says the heater core is clogged. You may want to flush the core before you go ripping the dashboard apart. I just did this in my 2000 Taurus.
Seems the heater core bypass pipe provides a path of lesser resistance for the anti-freeze. During the summer, while the heat is off, the scale and rust builds up and gradually blocks the coil.
here's a link to the pictures I took while flushing my Taurus this weekend:
http://s35.photobucket.com/albums/d170/spock8113/2000%20Taurus%20Heater%20Core%20Flush/
Once the heater core is flushed, I would recommend an entire cooling system flush to be sure all rust and scale is no longer present in the system. It seems, as stated above, that the water pump impeller can rust and deteriorate becoming a major source of coil-clogging debris. |