Chevrolet 1999 Express Van Owner's Manual page 113

Then, adjust the mirror angle by pressing the outer
arrows on the switch until the mirror is adjusted where
you want it.
Select the mirror you want
to move by rotating the
switch clockwise to adjust
the passenger's side mirror
and counterclockwise to
adjust the driver's side
mirror. The center position
is neutral.
Your electric outside
rearview mirrors can be
defrosted by pressing the
switch next to the heater
controls. (See "Comfort
Controls" in the Index).
Convex Outside Mirror
Your passenger's side mirror may be convex. A convex
mirror's surface is curved so you can see more from the
driver's seat.
CAUTION:
A convex mirror can make things (like other
vehicles) look farther away than they really are.
If you cut too sharply into the right lane, you
could hit a vehicle on your right. Check your
inside mirror or glance over your shoulder before
changing lanes.
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