Chevrolet 2013 VOLT Owner's Manual page 217

WARNING
The electric fans under the
bonnet can start up even when
the engine is not running and can
cause injury. Keep hands,
clothing, and tools away from any
underbonnet electric fan.
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 surge tank pressure cap -
even a little - they can come out
at high speed. Never turn the cap
when the cooling system,
including the surge tank pressure
cap, is hot. Wait for the cooling
system and surge tank pressure
cap to cool if you ever have to
turn the pressure cap.
If coolant is needed, add the proper
DEX-COOL coolant mixture at the
coolant surge tank.
The coolant surge tank pressure
cap can be removed when the
cooling system, including the surge
tank pressure cap and upper
radiator hose, is no longer hot.
1. Turn the pressure cap slowly
counterclockwise. If a hiss is
heard, wait for that to stop.
A hiss means there is still some
pressure left.
2. Keep turning the cap and
remove it.
Vehicle Care
3. Fill the coolant surge tank with
the proper mixture to the cold
fill line.
4. Replace the pressure cap. Be
sure the pressure cap is
hand-tight and fully seated.
If the pressure cap is not
tightly installed, coolant loss and
possible engine damage may
occur. Be sure the cap is properly
and tightly secured.
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