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Message: <blockquote data-quote="CocoaJeff" data-source="post: 22794" data-attributes="member: 7833">Well I haven't experienced that problem in my Nox, yet.  But my first thought was a faulty or malfunctioning blend door actuator.  I had several go out in my Impala.  One directs the air through the various vents, one controls hot/cold, etc.  When that particular one went out, it was the middle of winter and I couldn't turn the heat on until I replaced it.  Do you ever hear any unidentified "clicking" sounds?  That's what they do when the cheap little plastic gears start to strip.I take it you have the fully automatic HVAC system?  Could also be a malfunctioning temperature sensor or something like that.  After one of these events, do you know if it's throwing any codes?</blockquote>