2000 Chevrolet Express Van Owner's Manual - Page 108

yellowblue CAUTION: It can be dangerous to drive with the rear swing-out windows or rear door(s) open because carbon monoxide (CO) gas can come into your vehicle. You can't see or smell CO. It can cause unconsciousness and even death. If you must drive with the rear swing-out windows or rear door(s) open or if electrical wiring or other cable connections must pass through the seal between the body and the rear swing-out windows or rear door(s): D Make sure all windows are shut. D Turn the fan on your heating or cooling system to its highest speed with the setting on VENT, HEAT, BLEND or DEF. Additionally, on vehicles with heating/air conditioning systems, NORM A/C or BI-LEVEL A/C can be used. That will force outside air into your vehicle. See "Comfort Controls" in the Index. D If you have air outlets on or under the instrument panel, open them all the way. See "Engine Exhaust" in the Index. Rear Swing-Out Window Your rear swing-out windows work the same way, but the latch is at the bottom edge of the window. 2-32