The problem isn't the servo, it's the door itself. It's sticking & the servo can't open it. I might've caught a break though, after loading up with some WD-40 I noticed I now can adjust my A/C temp, although it still doesn't blow as cold as I would like. Perhaps I'll try recharging it. In any event I'll give it a few days & post my results. Thanks for everyone's help.
GregH