Buick LaCrosse Owner's Manual page 367

Windshield wiper blades should be
inspected for wear and cracking.
See
for more information.
Replacement blades come in
different types and are removed in
different ways. For proper type and
length, see
To replace the windshield wiper
blade:
1. Pull the windshield wiper
assembly away from the
windshield.
.
2. Lift up on the latch in the middle
of the wiper blade where the
wiper arm attaches.
3. With the latch open, pull the
wiper blade down toward the
windshield far enough to release
it from the J-hooked end of the
wiper arm.
4. Remove the wiper blade.
Allowing the wiper blade arm to
touch the windshield when no
wiper blade is installed could
damage the windshield. Any
damage that occurs would not
be covered by the vehicle
warranty. Do not allow the wiper
blade to touch the windshield.
5. Reverse Steps 1 through 3 for
wiper blade replacement.