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Message: <blockquote data-quote="stutaeng" data-source="post: 24822" data-attributes="member: 6175">Also check that little thermometer on the driver's side headliner. My 06 had this condition where it only blew cold air at the lowest setting, any other temperature was not really cold. Similarly, on the hot setting: wasn't really hot until I hit the hottest temperature, then it was 100% hot full blast. I was about to replace the HVAC module, but somehow came across an thread on the TYF. That thermometer has this little fan and mine was basically seized. I replaced it and everything works fine now. It's GM Genuine part #22834330.</blockquote>