GMC 1998 Savana Van Owner's Manual page 277

2. Unclip the bottom of the lamp from the grille.
3. Remove the bulb by twisting
it out of the socket.
Turn the bulb to remove
it.
Install the new bulb.
4. Reverse these steps to reinstall the lamp.
Taillamps
1. Open the rear door.
2. Push the socket protector until you can see
the fasteners.
6-37