1999 Pontiac Firebird Owner's Manual - Page 129
1999 Pontiac Firebird Manual
Page 129 highlights
yellowblue Open the hatch and find the tab along the left side trim panel. Lift up the tab and turn the valve counterclockwise to release the hydraulic pressure. Turn the ignition key to LOCK. You can now raise or lower your top manually. Be sure to close the valve after installing your top so you can raise or lower it electrically later. 2-73
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yellow
blue
2-73
Open the hatch and find the tab along the left side trim
panel. Lift up the tab and turn the valve counterclockwise
to release the hydraulic pressure. Turn the ignition key to
LOCK. You can now raise or lower your top manually.
Be sure to close the valve after installing your top so you
can raise or lower it electrically later.