Chevrolet 1998 Express Van Owner's Manual page 104

A
CAUTAN:
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):
Make sure all windows are shut.
CAUTION: (Continued)
I
CAUTION: (Continued)
Thrn the fan on your heating
or
cooling
system to its highest speed with the setting
Additionally, on vehicles with heatingair
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.
If you have air outlets on or under the
'.
instrument panel, open them all the way.
See "Engine Exhaust" in the Index.
on
VENT, HEAT, BLEND
or DEE
Horn
Press the horn symbol in the middle of the steering
wheel to sound the horn.