The air conditioning problem was due to a blown 15-amp fuse. This is a dual-prong problem, since the air conditioning system uses an AGX 30-amp fuse. We only had an AGC 15-amp glass fuse to pop in the bars, and that fuse saved us untold dollars in repairs when really cold air came through the vents. Whew! Later the 15-amp was replaced with the correct 30-amp fuse.