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Check the coolant level...if the level is too low, it will not flow through the heater core. Next, check the thermostat. If it is sticking, it will not let the coolant heat up. These are inexpensive, and easy to change by the owner. If none of these work, have the heater core checked by a mechanic. An obstruction in the core, or the heater hoses, will keep coolant from flowing through the core, thus not heating the air.

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17y ago

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