Chevrolet 2001 Silverado 1500 Pickup Owner's Manual page 240

The following steps must be performed on each of the
-
push pins to remove the air dam:
4-18
1. Insert the tip portion of a
-
flat tip screwdriver into
-
pin slot and
the push
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 pair of pliers
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're finished off
-
3. Pull the push pins and
lower air dam assembly
away from the retainers
until the lower air dam
is free.
-
road driving.