Emissions and Exhaust Systems
Heating AC and Engine Cooling
Mercury Sable
Heater Cores and Blower Fans

What would cause white smoke to come out of heater vents?

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2015-07-17 17:42:14
2015-07-17 17:42:14

Most likely the heater core is leaking. If there is also water on the floor and an antifreeze smell in the passenger compartment, those are also signs of a cracked heater core. Also, GET THAT TEMP GAUGE FIXED!!! You could be overheating and not even know it. Once the motor overheats, you're risking a blown head gasket, a VERY EXPENSIVE repair, or even worse, a blown engine. If steam is coming out of the vents it is very possible the motor is overheating. You need two repairs, your heater core and your temperature gauge.

My heater core was replaced since it had a hole in it. The blower was also replaced but with a used one. The guage is now working and so far, no more white smoke. Heater does not get hot though and the blower motor is very loud. Hey, ya gotta laugh a little...from one thing to another. I suppose the worse thing is over. Thank the Lord though I did not have a new car since the guy that worked on it did a number on my dash.

Symptom: on a 2000 Ford Contour, white smoke came through the vents and the smeel was acrid. We switched the car off. A few hours later, the car was fine, no more smoke, but the heater didn't work on one speed setting.

Solution: there is a resistor block which controls the blower speed in the ducting. When one of the resistors goes, white smoke is fed dirrectly up to the vents. Replacement is easy (admittedly while doing a head stand in the passenger footwell) and fairly cheap.

Suggestion: many other cars will have a similar layout. Check this out before investing in a new heater core...

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Related Questions


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.



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



It could be steam from the heater core


in my experience it is a slight leak in heater core it will be antifreeze causing this replace heater core and problem will be fixed


I feel these are unrelated but you can investigate a leak in the hoses leading to the heater core as they maybe leaking onto the exhaust pipe, that would produce white smoke, but not from within the tailpipe exhaust. Water and oil leaks will produce white smoke the smell will help you determine which it is.


That is probably antifreeze steam. Your heater core is a small radiator used to heat your car. The engine heats the antifreeze and circulates it through the heater core. Your blower blows heat through the core (radiator) into the car, and warms you. If the core gets a small leak, it will put out steam.



Heater core needs to be checked May need to be changed or cleaned answer heater core is bad, replace with a new one


== == Could possibly be a heater core leak. Coolant is getting blown up through the vents when you have the heater on. May need to do a heater core check and replace. if you have the a A C on it means that your A C freon its leaking, also if you run the AC on with one window open it will create smoke fron the humidity coming in to the car if it's white somke it's dangerous "cause it will put you to sleep while you drive and you will not feel it..


white smoke is water, black smoke is oil. remember that!


Not directly, but it can crack or blow your head gasket. (Which will cause white smoke) Happened to me =(



White smoke with the a/c on means that the a/c system is freezing up and you need to check the pressure switch........... White smoke with the a/c off means that you have a leaking heater core........


white smoke indicates coolant in the ignition chamber. check for blown head gasket heater core has 2 fixes. install a new heater core, or disconnect heater hoses from heater core and join them together so coolant will flow.2nd fix will completely stop heater from working




white smoke from coolant usually indicates oil in coolant,this usually means a blown headgasket



I know the white smoke would be caused by coolant, which would be leaking into the combustion chamber.


White smoke is a coolant leak Black is a rich condition Blue is burnt oil.



White smoke means water, blue/black smoke means oil, black smoke can also mean the fuel mixture is too rich.


Most common cause is a head gasket leak. This allows coolant to get into the combustion chamber resulting in the cloud of white smoke out the tailpipe.



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