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Message: <blockquote data-quote="st82" data-source="post: 2498813" data-attributes="member: 855071">I am noticing for the past 2-3 days, sometimes, even if i switch off the fan, i still get the a.c or the heat blowing in. side note, i got P0420 check engine light on for the past 2-3 days as well. does it have anything to do with the check engine light? or is it normal to have some air coming in all the timeDoes it mean that, yes, wind blowing is normal even after switching off the fan, if the vent is not closed? please give me a clear idea since i do not have much idea about cars.</blockquote>