Buick 2000 Park Avenue Owner's Manual page 280

To change the filter:
1. Remove the wing nuts on the air cleaner
housing cover.
6-18
2. Remove the air intake hose that snaps over the
throttle body by pulling the hose upward and away
from the throttle body. As you are detaching the
hose, remove the air cleaner housing cover by
pulling upward and rearward.