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I noticed today that in my 2005 Civic EX, with the fan switch in the off position, there is a small amount of air flowing through the vents. I checked it by turning the heat control **** up , with the fann still in the off position, and a small amount of hot air was flowing. I would think that off means no air flow,is this a common problem? I don't remember ever experiencing it with other Hondas.

 
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Are you driving on the highway when it happens? Mine does the same thing if the car is moving faster than a certain speed, and I think it's normal. But I mean it's a small amount of air, I can only feel it if my hand is directly in front of the vent.

 
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the intake vents are in front of the car, near the windshield wipers. so when the car moves, air will flow thru the vents and into the car on its own, even with the blower turned off. its mainly done so that you get fresh air coming in the car. but if it bothers you, press the recirculation button on the dash which only blows air from inside the car. if the fan switch is off in this mode, air should not come out the vent.

i think its a good feature tho. on the highway i dont even need to waste power running the blower. air comes thru on its own

 
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^I agree I like it, especially since the option to shut it off is there, if you know how to do it

 
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thanks to all for the reply. I tried pushing the recirculate switch and it does block flow with the switch off. This switch obviously is designed t leak a little air when turned off, because of everyone who has replied that theirs does the same thing. Now I have to find something else to worry about. Thanks again.