Manual Windows - GMC 2003 Yukon Owner's Manual

Windows
{
CAUTION:
Leaving children in a vehicle with the windows
closed is dangerous. A child can be overcome
by the extreme heat and can suffer permanent
injuries or even death from heat stroke. Never
leave a child alone in a vehicle, especially with
the windows closed in warm or hot weather.
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Manual Windows

Turn the hand crank on each door to manually raise or
lower the manual windows.