Sliding door won't close. Starts to close then chugs a little, opens again.

Probably worn center roller , to much slop causing binding. Turn 'main power door switch off and open the door about halfway ,then slide it back and forth about an inch each way if you hear clunking or looseness in the rear center of the door ,that's the roller that needs replaced. not uncommon. Also not typically a DIY job. Not to technically difficult , but really easy to screw up.

a/c do not work.