Hmm...check the connections behind the radio faceplate/ICP and also check the connections that go into the RCU. Make sure they are free of corrosion and are firmly seated. Sounds like something has come loose.
Ya if the heater stays on defrost, then there's probably a vacuum line disconnected, since the doors are vacuum operated, and they default to defrost so you can see. And if the radio and controls don't work, then either they're all unplugged too, or they fuse is blown, or gone - make sure they didn't pull the fuse and forget to put it back in.