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This one is tough, because getting to the heater core takes considerable effort. A bad heater core can be a problem due to lack of cooling-system maintenance. Replacing a core is a big job because it has to be accessed under the dash. If your car needs a new core, flush the cooling system and install new hoses, too. If you're looking at a potential purchase that needs a core, be sure to factor in the labor cost. View Related Article
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