Well, the back windows and the convertible top are more than likely not an electrical problem. The back windows are very well known for ceasing their functioning pretty early on. The motor is just dead...happens to us all. Same thing with the convertible top...it's probably just the hydraulic pump that's shot. My suggestion is to just remove the hydraulics system and put the top up/down manually as it is costly to replace the hydraulic pump.
As far as the blower motor is concerned tho...I have no clue.