Ok sound like the fan motor. The whole dash does not have to be removed though. Remove glovebox, remove console, remove instrument panel attaching screws and push it back to get at the footwell ducts, remove vacuum motor, remove fan wires, remove footwell duct assembly (the big plastic assembley that the fan etc is in), remove fan retaiining clip and fan. Be careful not to lose the fan wires (attach a string or wire to pull them through the hole) or damage the duct case seal. Allow yourself half a day to do it. A lot of fiddly fasteners to find, undo and replace and hard on those with bad backs but if you take your time its not too hard.