GMC Sierra Denali 2014 Owner's Manual page 180

8-6 Climate Controls
1. Open the lower glove box door
completely.
2. Remove the four screws from
around the lower glove box. The
door does not need to be
removed to access the screws.
3. Close the lower glove box door
and pull it from its frame to
remove the entire unit.
4. Release the two tabs holding the
service door. Open the service
door and remove the old filter.
5. Install the new air filter.
6. Close the service door and
secure the tabs.
7. Reverse the steps to reinstall the
glove box.
See your dealer if additional
assistance is needed.