If the roof AC is blowing cold air, its probably working ok. My take is the single AC is just not enough to cope with the super heating that takes place in the cab area when the sun beats on the coach. As I mentioned in an earlier post, one thing I did that helped some, was to put a fan on the dash blowing toward the rear, to get that hot air back so it could be cooled. Yes that helped some, but did not solve the problem, so that is why I had the second AC installed in the front. Still don't have it back, as they are also installing a leveling system so next week I should be able to tell just how effective all this is.
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