Question about 2004 Nissan Altima

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Heater Troubles The heater only blows hot air when the car is moving, when it's not moving it blows cold air. Is it the heater core or something else.

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Possibly/most likely, a restriction of some type to core or in core, more than likely corrosion internally. Cheapest & best thing to try is complete cooling system flush, & reverse flush, to move that out of there if it will come. If that fails, I would circulate C.L.R. through heater core to help remove any calcium etc deposits.

Posted on Dec 12, 2008

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