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The average cost for a Buick LaCrosse heater core replacement is between $490 and $751. Labor costs are estimated between $457 and $576 while parts are priced between $34 and $175 .
It could be indicating a problem with an actuator. But I am leaning more towards something with the controller. But can also check the heater fan fuse and relay. I would advise you to replace any bad component.
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