remove the panel and see if they have been blocked to stay up. . i have not seen the inside of a cc rear door. i suppose it has the same or similar window regulator. if it isnt blocked up remove it and see what the teeth on the gear and crank look like. or mayeb the glass is stuck to the weather stripping or something like that.
Thanks for the reply. I can reach inside and feel a little surface rust on the regulator, a while back I gave it a shot of penettrating oil but no luck. I'll pick up a set of regulators and try them.