2000 Chrysler 300 no heat on the highway

2000 CHRYSLER 300
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Heater problem
2000 Chrysler 300 6 cyl Two Wheel Drive Automatic

Ive got a odd problem. My car has heat as long as im in town. But once i get on the highway the temp falls back to "C" on the guage and i lose all heat in the vehicle. Ive already changed the thermostat and replaced all coolant. There is no air in the system im at a loss here.
Any help or ideas would be great.
Thank you.
Dec 13, 2008 at 11:14 AM
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