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Message: <blockquote data-quote="bigdogYJ" data-source="post: 24821" data-attributes="member: 11207">Got it.  Wasn’t sure how far you got in diagnosing the command vs actual.  Sounds plausible that the control head could be the culprit.  I guess you could confirm that the control wire for the relay is getting lit up or not, can’t remember if it’s ground controlled or bat +.   But that would confirm no signal from control head.  As a side note (and not sure how much programming is available for the manual control head) but my 04 Yukon xl with auto HVAC had an issue where it would not go into recirc mode.   The button indicator would light up but watching the command and actual counts they wouldn’t move. Everyone I conferred with condemned the control head.  Since I had an active subscription for that VIN on GM tech connect, I just reflashed my control head.  Recirc started working and continues to function today, 2 years later.   Again, not sure what amount of programming, if any, is available for the manual control head but something to consider.  Good luck.</blockquote>