Chevrolet 2003 Silverado Owner's Manual page 305

1. Insert a tool into the
push-pin slot and pull
downward until the
push-pin snaps loose.
2. While continuing to pull
downward on the
push-pin, squeeze and
turn the expandable
end of the push-pin with
a tool until it releases
from the retainer.
When you're back on roads, though, be sure to replace
the air dam.
Notice: Operating your vehicle for extended
periods without the front bumper lower air dam
installed can cause improper air flow to the engine
and may allow things like fog lamps or tow hooks
on the front of your vehicle to be damaged. Always
be sure to replace the front bumper air dam when
you are finished off-road driving.
3. Pull the push-pins and
lower dam assembly
away from the retainers
until the lower dam
is free.
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