Chevrolet 2001 Express Van Owner's Manual page 122

Heated Outside Rearview Mirrors (If Equipped)
An indicator light on the button will be lit anytime the
heated outside rearview mirrors are activated.
Your rear window defogger will be on anytime the
heated mirrors are on. If your vehicle has a rear window
defogger, see "Rear Window Defogger" in the Index.
Your outside mirrors can be
defrosted by pressing the
button near the fan control.
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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