It's probably the drain hose again, it was 5 years and it needed cleaned out now its 5 years later just needs cleaned again.
The AC housing will always have condensation on it if the metal is cooler than the outside air, thats just science. and the AC will turn on automaticly when the defroster is on, the AC pulls out the moisture in the air and kicks out dry air, even with the heat going the AC will still come on and 'condition' the air. It don't hurt nothing and its good to run the AC a few times in the off season to keep the parts moving.
2006 SE 6 Speed, Solar Yellow. Zone 2" Hydro BB, Sway Links, and Steering Stabilizer. 31x10.5-15 Bridgestone Dueler AT Revo. Alpine CDA9813, Polk MM6, Polk C400.4