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There maybe air in your collant system and/or you need to flush and clean your heater core. Check your rad cap it may not be holding the pressure right and lettting air in,also check the heat regulator and the door might need to be reset.

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βˆ™ 2015-07-15 21:37:08
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Q: How do you fix a car heater on a 1991 Chevy Corsica that only blows cold air and the thermostat is working right?
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