GMC 2001 Yukon XL Owner's Manual page 27

Pull on the release lever located in the lower middle to
unlatch the seat from the front of the floor and pull the
seat out. Use one hand on the release lever and the other
on the handle to pull the seat out.
Suburban/Yukon XL: If your vehicle has third row
seating, it can be taken out for more cargo space.
To remove the seat, fully open the rear doors and enter
the rear of the vehicle.
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To unlatch the seat from the
back of the floor, pull up on
the release lever labeled 2
at the rear of the seat and
lift the rear of the seat up,
off of the floor.
Fold the seatback forward into the seat cushion by using
the lever labeled 1. The seat cannot be removed unless
the seatback is folded.
To unlatch the seat from the floor, pull up on the release
lever labeled 2 at the rear of the seat and lift the rear of
the seat up, off of the floor.
Pull on the strap, labeled 3, at the rear of the seat to
release the front seat latches. Then, pull the seat straight
back, towards the rear of the vehicle and remove it.
There are wheels at the front of the seat to assist you.
Replacing the Rear Seat
Utility: To put the seat back in, place the front of the
seat on the load floor facing towards the front of the
vehicle. Slide the wheels into the slots on the floor and
lock into place using the hooks there. Once the latches
are engaged, let the seat drop into place. Release the
lever labeled 1 to return the seat to its upright position.
Push and pull on the seat to make sure it is locked
into place.