Best Answer

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.

User Avatar

Wiki User

โˆ™ 2004-11-17 21:49:22
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: What can cause smoke to come out of the AC and heater vents?
Write your answer...

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 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.

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

Bad heater core.

Why does no air come out of the vents?

heater fan broken.

Why does smoke come through vents in car when the heater is running?

The smoke you see may be moisture/steam. The heater core is probably leaking engine coolant. If the "smoke" has a sweet smell to it, it's engine coolant. More info about the vehicle such as model and year would help.

Why does smoke come out of vents when i turn on heater in 1994 grand Cherokee?

Probably not smoke. Your heater core may have a small leak and the "smoke you see is actually steam.Had a similar problem with an F-250 P/U. Cost about $100.00 parts and labor. But that was back in the day...

What causes smoke to come through the vents in the dash board in your 1991 deville?

could be a leaking heater core ( Steam ) . Depends on WHAT KIND OF SMOKE. Is it steam or smoke. Smoke like something burning could be oil. electrical, etc

What would cause water to come in your floor vents?

Could be that your heater core is leaking May also have a plugged evaporator hole.

On your 1996 240 Nissan heat will not come through all vents inside?

The heater blower may not be working properly. Without the heater blower working, the air will not come through the vents.

How come smoke comes out of the ac ducts in a ford focus?

Just a thought - - - It MAY not be smoke. You could have a pinhole leak in the heater coil which allows vaporized engine coolant to spray into the car via the A/C vents.

What would cause smoke to come out of heater ac control box on 94 Chev Astro Van?

A Fire!

Why would smoke come out of the ac vent?

smoke coming from a/c vent indicates that the heater core is leaking and needs to be replaced.this smoke is hot antifreeze, it will not cause a fire but it does stink and will eventually cause car to overheat

On Kia Sedona what is the HTH RR switch for?

It is for the rear heater. Press the button and this will enable heat to come out rear heater vents.

Why does steam and mist come through your vehicle vents?

You need to check and/or replace the heater core

What would cause smoke to come out of the dash of a 2007 kia sedona with only 15000 miles on it?

bad heater core under dash

Why do you get hot air at floor and defroster vents but only cold air at the dash vents vents in a 1995 chevyvan 20?

the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater