I only use the melee weapon in the room with the dancefloor then i go to the other two rooms and kill everything but carpenter doesn't appear. I go back to the dance floor and everyone is gone. can't find carpenter! help

Okay- the nightclub...Since you beat everything- including the dance floor zombies- and the vampires w/guns, and the hundreds of swarming zombies. You go downstairs to the dance floor area, and turn right, the first bar at the right should have an elevator, then you have a "kinda- of- hallway" to fight through more zombies, then when you hit the end of the "Hallway" there should be a little mark (it's like the glowing mark at the end of levels when have completed them) Once you walk over it- Carpenter should appear.