i was doing the mission where i had to set off an explosion in vault 22 when my ed bot disappeared and has never shown back up. i tried searching every inch of the place but still no sign of him. It does show he's there on the map though. Is there any tips on getting him back??????????????/

Try using the elevator in Vault 22, go from top floor to bottom, it's supposed to reset companions.

it still didn't work... it still says he's at vault22 though... any other suggestions????????????