Also gentlemen , the right third row seat has an air vent on its side which sucks in air when AC is on . If you have the seats plastics still on the plastic gets attached to the vent due to suction and you will get very little air from your 2nd row and 3rd row ac vents, just something to keep in mind.
When I was taking delivery of my 21 G very little air was coming from 2nd row and 3rd row vents and then the toyota guys showed me that this third row seat plastic covers the vent stopping air intake as soon as you remove the plastic from the vent air flow is back to normal.
The vent is here on the right side of seat if you put your hand there when AC is on you can feel the suction