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Its obvious to me the system was designed to keep the windows clear in the winter regardless of what setting the vent controls are on.
I took a piece of rubber baseboard molding from home depot and made a block off for the center defrost vent.... worked great but actually caused another issue..... the extra air decided to come out the side window defrost vents which promptly caused both side windows to condense to the point my side view mirrors were completely useless!
Also it would not dry up when underway like the front does so i had to keep rolling the windows down and back up to wipe the condensation off. Just a big mess.
So.... if one block off is good three must be better!
I used some of the same rubber and made block offs for the side window defrost vents and now its all good. Stronger air velocity from the round dash vents and much,much better from the floor vents, Definitely makes my vented seats feel a lot cooler!
I will remove the block offs once winter gets here
Bottom line is i dont think the "fix" GM has is worth doing as that air will find another place to get out that IMO is just as bad if not worse.
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