GMC 1997 Savana Van Owner's Manual page 271

2. Un-clip 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.
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