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It sounds like your coolant level is low if you have no heat at idle (or low speed), but your heater blows hot air when you travel at a higher rate of speed. I would remove the radiator cap (when the engine is cool) and check the anti-freeze level. If you find your level is low you may want to also watch and see if you have any coolant leaks that are causing the anti-freeze to escape.

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Q: Why does 2006 Chevy impala blow cold air when idling but hot when driving?
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