medical09, If your dash air and heating controls are anything like mine, there is a little snow flake button that needs to be pushed to activate the AC compressor, Also there should be a button to just recirculate coach air and not bring in outside air.
As for the CO monitor, can't help you with that one. Never have had problems with mine.
Otherwise good luck with the Bounder, I'm sure you're going to like it.
My wife and I got our start with a 1990 Bounder and loved it!
05 Southwind 37C