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The heater core is blocked, or a heater hose has collapsed, keeping hot engine coolant from getting to the core. The "blend air" door may be stuck in the open position, keeping warm air from circulating, and dumping in cold outside air. I am assuming that engine coolant and water pump is good.

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โˆ™ 2016-12-28 03:25:37
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Q: Why would a truck heater only blow cold air?
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