Chevrolet 2006 Express Van Owner's Manual page 70

6. To tighten the belt, push down on the child restraint,
pull the shoulder belt to tighten the lap belt portion
and feed the shoulder belt back into the retractor.
If you are using a forward-facing child restraint, you
may find it helpful to use your knee to push down
on the child restraint as you tighten the belt.
You should not be able to pull more of the belt out
of the retractor once the lock has been set.
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7. If your child restraint manufacturer recommends
using a top tether and the position you are using
has a top tether anchor, attach and tighten the
top tether to the top tether anchor. Refer to
the instructions that came with the child restraint
and to Lower Anchors and Tethers for Children
(LATCH) on page 1-42.
8. Push and pull the child restraint in different
directions to be sure it is secure.
To remove the child restraint, if the top tether is
attached to the top tether anchor, disconnect it.
Unbuckle the vehicle's safety belt and let it go back
all the way. The safety belt will move freely again and
be ready to work for an adult or larger child passenger.