Question about 2000 Hyundai Sonata

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Stinky smoke from vents heater and defroster off

My vents are releasing a smelly smoke even when heater and defrosters are off. what could be the cause and cost

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You have a leaking heater core, the smell is coolant.

Posted on Mar 20, 2014


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My 1985 buick regal limited lets smoke into the car when i turn on the heater..what can cause this?? also when i open hood i see a little bit of smoke too?? if oil is burning on top of the motor,can it get...

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Rate my answer...........Thanks

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No heat or defrost 1992 subaru legacy (air works fine)

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Smoke coming out vents when defrost is on and temp gauge goes up and down in 1994 Taurus

The fluctuation in the temp gage indicates a low coolant situation. The smoke you see from the defroster vent is actually antifreeze that is leaking from the heater core somewhere and as the antifreeze evaporates from the heat it causes a vapor to produce. You should smell a very sweet smell when you see the vapor. If so it is definitely antifreeze. Find the leak and fix it. Then refill your coolant system to specs and you should be good to go.

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