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Thermostat stuck in the open position or heater core clogged. Replace the thermostat and see where you stand. This would also be a good time to replace any coolant hose that needs replacing and to flush the cooling system and change the coolant. Could also need to change your radiator cap

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โˆ™ 2005-01-29 05:00:10
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Q: Why is only warm or cold air blowing when the heat is all the way on?
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