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Air Conditioning and Coolant
Heater Cores and Blower Fans

What can cause smoke to come out of the AC and heater vents?

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Wiki User
2004-11-17 21:49:22
2004-11-17 21:49:22

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

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If that smoke is more like steam, you have a leaky heater core.

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If it is smoke the heater fan motor has failedORElectronics in the heater have failed ORif it smells like anti freeze rather than smoke the heater core has failed.

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Means that your heater core is leaking coolant. Has to be replaced.


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