The AC works in the rear and on the driver side but not the front passenger. The shop says 8 hours and $800 to fix some flap that isn't opening. Any ideas how to do it cheaper?

 

Sure,replace the actuator.
You can easily buy them on amazon,

ebay etc
https://www.ebay.com/itm/604-029-HVA...72.m2749.l2649

Youtube can be your friend

 

• The actuators stick a lot. Tap/knock/hit it with a screwdriver while shifting the air from hot to cold and back and forth. $800 fix at the dealership, SMH

 

I have my lower vents partially apart. With inspection camera i can see both blend doors are moving, but passenger side doesnt look like its sealing as tight. Would that be enough to keep pass side from getting hot air?