How do you replace it on a 98? mine's starting to go out and it's $500 at the dealership.

 

I think the process it too involved to give enough detail in a forum.

 

anywhere where i can get info to replace it.

 

No part numbers, but here is how you can get at the blower motor itself, it is mounted behind the glovebox:
http://forums.audiworld.com/a6/msgs/311192.phtml

If you post some more information about your car (year, engine) I can look up the part number on my ETKA at home.

 

98 2.8L