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A leaking heater core. oil is leaking on the engine and is burning and beining drawn in by the vent or the blower motor is going out Are you sure it's smoke or is it steam? If your windows are steaming up and it smells like maple syrup , your heater core is probably leaking.

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โˆ™ 2004-11-17 21:49:22
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Q: What can cause smoke to come out of the AC and heater vents?
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The heater core has failed.


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The blower resister is not supposed to be grounded. The smoke may be steam from a leaky heater core.


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