Chevrolet Captiva Owner's Manual page 216

9-18 Vehicle Care
Warning
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 coolant
surge tank pressure cap-even a little-
they can come out at high speed.
Never turn the cap when the cooling
system, including the coolant surge
tank pressure cap, is hot. Wait for the
cooling system and coolant surge
tank pressure cap to cool if you ever
have to turn the pressure cap.
Caution
It is not needed to add coolant more
frequently than the recommended
interval. If you are adding coolant
often, this may be a sign that your
engine needs maintenance.
Contact your CHEVROLET retailer
for a check of the cooling system.
Caution
In cold weather, water can freeze and
crack the engine, radiator, heater core
and other parts. Use the recommended
coolant and the proper coolant
mixture.
Warning
You can be burned if you spill
coolant on hot engine parts. Coolant
contains ethylene glycol and it will
burn if the engine parts are hot
enough. Do not spill coolant on a hot
engine.
1. Remove the coolant surge tank
pressure cap when the cooling
system, including the coolant surge
tank pressure cap and upper radiator
hose, is no longer hot.
Turn the pressure cap slowly
counterclockwise about one-quarter
of a turn. If a hiss sound is heard,
wait for that to stop. This will allow
any pressure still left to be vented out
the discharge hose.
2. Then keep turning the pressure cap
slowly, and remove it.