1999 Chevrolet Lumina Put New Thermostat Car Will Heat First There Would Heat

1999 CHEVROLET LUMINA
150,000 MILES
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put new thermostat in the car will not heat. when thermostat was first put in there it would not heat then when i hit the highway it was heating and then it started blowing cool air out again. so whats the problem
Jan 27, 2013 at 1:49 AM
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