GMC 2000 Savana - Manual (Page 120)

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