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There is a faint smoke that leaves an oily film coming through my inside car vents when the car is warm and idling (like at a light) and the motor fan kicks on. It's when the fan kicks on is when it happens. What could be wrong?

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You have a heater core leak. The smoke is actually coolant vapor. Usually a good radiator sealer will work. The best thing to do is have a mechanic replace it, if you plan on keeping the car.

Posted on Nov 05, 2010

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