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1998 Mercury mountaineer heat is very hot but there is a oily mist that is coming in the vents do you need to replace the heater core?

In: Mercury Mountaineer [Edit categories]

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Answers.com > Wiki Answers > Categories > Cars and Vehicles > American Cars > Mercury > Mercury Mountaineer > 1998 Mercury mountaineer heat is very hot but there is a oily mist that is coming in the vents do you need to replace the heater core?