2004 GMC Canyon Owner's Manual - Page 92

Windows {CAUTION: Leaving children, helpless adults, or pets in a vehicle with the windows closed is dangerous. They can be overcome by the extreme heat and suffer permanent injuries or even death from heat stroke. Never leave a child, a helpless adult, or a pet alone in a vehicle, especially with the windows closed in warm or hot weather. Manual Windows On a vehicle with manual windows, use the handle on each door to open and close each window. 2-12