If you have a squeaky HVAC blower in your C5 A6, you know how annoying it can be in the otherwise quiet and tranquil cabin. Luckily, replacing it with a new one is not all that difficult, and for the really mechanically inclined, it's not hard to put a dab or two of oil on the bearings and clean the gunk out of the motor.
Once you remove the bolts, you can lower the glove box to the floor. You'll be looking at the HVAC box, among other things. The round case you see is the blower fan. You can pop the access hole cover off, and spray a little lube in there, and see if that eliminated the squeak. If not, move on to replacing blower motor, or for the brave, pull it apart, and clean and lube it.
Using your harness connector tool of choice to remove the contacts from the harness connector on the body of the motor case. This is required, as they aren't long enough to pull the motor out when in place. The rubber cover just pulls off.