Battery drains, ac doesn't blow, and alternator is good (supposedly)?

I own one of these and had the same problem. Being a mechanic, I had to figure it out myself. The fan does not blow until the alternator is putting out more than battery voltage (charging). I've also had alternator problems requiring three warranty replacement alternators. You probably need to get another new alternator. By the way, with the engine running, you should have 13.4 to 14.4 volts at the battery.