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Q: driver side vents will only blow hot air. no matter what setting on controls? on 2005 Hummer H2

controls seem to work fine for passanger side. could this be as simple as the temp door actuator for the drivers side is bad? is the instructions to fix the same as I saw for a 2003?
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theres a blend door actuator thats bad (to the right of drivers foot , when on the gas pedal) it is simple but awkward to replace and special attention need be paid during install so it's 'timed' right.
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