2008 GMC Savana Van Owner's Manual - Page 7

Power Seat To raise or lower the seat, move the center knob up or down. To move the seat forward or rearward, move the center knob toward the right or left. To raise or lower the front of the seat cushion, move the right lever up or down. To raise or lower the rear of the seat cushion, move the left lever up or down. If your vehicle has front power seat(s), you can adjust them with these controls located at the front center of the seat cushion. 1-3