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1989 gmc 2500 heater blows cold air?

Updated: 10/21/2022
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15y ago

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air door not moving or air pocket in system..check that both hoses to heater core are hot, if not u have a problem with flow such as previous suggested or bad water pump or thermostat. if both are hot the n problem lies within the heater controls.

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15y ago
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Q: 1989 gmc 2500 heater blows cold air?
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