1988 260E climate control problem

[88260e]

Just picked up a 88 260e and its got a few quirks! The main problem is the climate control does not work! When you turn it on the blower comes on and you can hear it blowing, but nothing comes out the vents. I checked the fuse, all the vents are open, but nothing is comming out. My other problems are running rough at idle, and you get a vibration from the engine in the car. And the back windows don't go down. Any help would be great!