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How Can I Tell If My Heater Core Is Going Bad?

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There are two signs that indicate that a heater core is going bad. One is if the windshield fogs up when the car is started, or if there is the smell of mildew.

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There are a few ways you can tell if your heater core is going bad. Start by checking for antifreeze in the car. Look for smoke coming from the vents or ducts. Last, make sure that the thermostat is in working order, and that the radiator has plenty of fluid.

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