GMC 2001 Envoy - Manual (Page 14)

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Seats and Seat Controls
This section tells you about the seats -- how to adjust
them, and fold them up and down.
Manual Front Seat
CAUTION:
You can lose control of the vehicle if you try to
adjust a manual driver’s seat while the vehicle is
moving. The sudden movement could startle and
confuse you, or make you push a pedal when you
don’t want to. Adjust the driver’s seat only when
the vehicle is not moving.
Move the lever located under the front of the manual
seat up to unlock it. Slide the seat to where you want it.
Then release the lever and try to move the seat with your
body to make sure the seat is locked into place.