GMC SIERRA 1994 Manual page 96

Sliding Rear Window (Option)
You
may have a four-piece or a three-piece sliding rear window.
To open a four-piece
sliding rear window,
pull the latch lever
forward and release it
from the latch plate.
Then, slide each side
of the window to an
open position.
To open a three-piece window, press the latch and slide the window to an
open position.
To close a four-piece window, slide each window toward the center of the
vehicle until they meet. Then, hook the latch lever on the latch plate and
press rearward firmly on the latch lever. Be sure the latch lever snaps in the
locked position.
To close a three-piece window, slide the window until the latch clicks in the
locked position. When you close the window be sure the latch fully engages
in the locked position.
Swing-Out Windows (Option-Extended Cab)
To open a rear
swing-out window,
just flip the latch open
and swing the glass
out.
The latch will catch when the window is fully open and hold window in the
open position.
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