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What causes steam to come through your vents inside the car?


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Wiki User
2015-07-17 17:40:47
2015-07-17 17:40:47

I would think if steam is coming from your vents that you have a leaking or defective heater core and or one of its components and in most cases the water leaking from the core can be found in the floor board on the passsenger side and this needs to be fixed right away due to engine coolant loss and the possiblity of engine damage from overheating. Also if the air conditioner developes a leak it could be mistaken for steam however if the freon is lost the ac will quit. , EzForJesus

heater core..


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You need to check and/or replace the heater core

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