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Q:

rear ac vents on 2005 Chevrolet Trailblazer

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The rear ac vents do not throw air. The blower and rear AC control have been replaced.
(1) Answer
Is the rear blower working? If not then the system will need to be properly diagnosed. If the rear blower is working and no air is coming out of the vents then begin looking for a blockage in air distribution system.