So im doing the quest to repair the air filters for the brotherhood.. and im in Vault 22 but i have no idea where to go.. im confused and really pissed off, getting impatient.. any help.

The quest marker is on the other side of the room, but i cant get to it.. i see a cave, but i have no idea how to get to it.. help please lol.

You have to search around, and you find a keycard that opens the very hard security terminal, then you can get into the caves.

If you're still on the 2nd (or was it 3rd?) floor...you need to keep going down the floors until you find a path that leads back up around to the other side where the quest marker is.

Wheres the terminal? i have the key card.. also, theres a elevator but i cant go into.. do i need to go into the elevator?

No, the elevator is optional. I think the terminal is on the 2nd floor, could be first. It's been a while since I did it.

yeah i found it thanks.

dammit, im in the cave, but its on a whole different floor then the cave that i need to go to.. im confused.