1996 Chevrolet Express Van Owner's Manual - Page 73

A CAUTION: It can be dangerous to drive with the rear doors 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 reardoors open or if electrical wiring or othercable connections must pass through the seal between the body and the rear doors: 0 Make sure all windows are shut. 0 l b r n 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 heatinglair conditioning systems, NORM A/C or BI-LEV A/C can be used. That will force outside air into your vehicle. See "Comfort Controls" in theIndex. If you have air outlets onor under the instrument panel, open them all theway. See "Engine Exhaust" in theIndex. To open the driver side rear door, pull the latch release lever at the inside edge of the door. Both rear doors canbe opened past 90 degrees by opening the doors past the first detent (90 degrees open), then opening fully. To close the rear doors, close the driver side rear door first. Then, closethe passenger side rear door. Check to make sure both doors are completely closed. 2-11