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Message: <blockquote data-quote="stutaeng" data-source="post: 28352" data-attributes="member: 6175">Those are the exact same symptom my 06 Suburban had, but I replaced the headliner temperature sensor and it got fixed...The blower slows down when you set it to 80? Umm, that's not supposed to happen...I think a scanner with bi-directional controls should be able to override the blend door actuators(?) That way you can rule that out. Or crawl under there and try looking with an inspection mirror to see if you can spot the shaft/gears moving as you move the temperature. It's the one on the passenger side I believe.Welcome to the forum BTW.</blockquote>