Chevrolet 1997 Astro Owner's Manual page 236

JTION:
Steam and scalding liquids from
a
hot cooling
system can blow out and burn you badly. They
are under pressure, and if you turn the radiator
pressure cap
- 0
even a little
--
they can come out
at high speed. Never turn the cap when the
cooling system, including the radiator pressure
cap, is hot. Wait for the cooling
system
and
radiator pressure cap to cool if you ever have to
turn the pressure cap.
5-18