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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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Related questions

What would cause steam smoke to come out air vents in 03 pt cruiser?

The heater core has failed.

Will a bad ground on blower resistor cause smoke to come out of vents?

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

Why would smoke come out of AC vents?

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

Why does white smoke come out of your vents when you turn on your heater in your car?

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.

Why does smoke come through the vents of your car when running the heater on a Grand Am 1994?

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

What would cause smoke to come out of vents of a 1999 Dodge Intrpeid?

Is it smoke or is it atomized freon leaking from the AC system? If it fogs the windshield and smells funny, you may have a leak in the AC/Heater system.

What would cause heat not to come out of vents when set to floor and vents?

There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.

What causes smoke 2 come from your ac vents when ac is on?

It is probably steam coming from a leaky heater core.

What would cause the service engine light to come on the heater to not work puffs of smoke to come out of the heater vents and the anti-freeze to blow on a 2004 Mazda 3?


Why does air or white smoke come out of the front vents?

Either the a/c system is freezing up or you have a leaking heater core.............

What would cause a burning rubber smell to come from the vents of your 91 Chevy Cavalier?

Bad heater core.

What would cause smoke to come from the vents of a 1991 Cadillac DeVille?

Check the Heater Core? Did it smell like oil or antifreeze. My Heater Core went, started blowing out smoke from the vent. Most Likely the Problem. "smoke" poured into my 1991 when the ac blew out all the freon and froze up the outside temp gage.

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