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I would suspect the thermostat is stuck in the open position so the water ( and motor ) never reach operating temperature. This is common where hard water ( water with a lot of minerals ) is in people's taps. I would suggest replacing the thermostat and draining out the coolant and replacing it with new antifreeze mixed with distilled water.

You could have an inoperative blend air door inside the dash, or the heater core is restricted internally.

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14y ago

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