Chevrolet 2015 Corvette Owner's Manual page 236

How to Add Coolant to the
Coolant Surge Tank
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.
Warning
Steam and scalding liquids from a
hot cooling system can blow out
and burn you badly. 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 coolant is needed, add the proper
DEX-COOL coolant mixture directly
to the surge tank but be sure the
cooling system is cool before this
is done.
1. When the cooling system,
including the coolant surge tank
pressure cap and upper radiator
hose, is no longer hot, remove
the pressure cap.
Turn the pressure cap slowly
anticlockwise about one-quarter
turn and then stop.
If a hiss is heard, wait for that to
stop. A hiss means there is still
some pressure left.
2. Keep turning the pressure cap
slowly and remove it.
3. Fill the coolant surge tank with
the proper DEX-COOL coolant
mixture until the level inside
stabilises at the cold fill line on
the front of the surge tank.
Vehicle Care
4. With the coolant surge tank
pressure cap off, start the
engine and let it run until the
upper radiator hose can be felt
getting hot. Any time during this
procedure, watch out for the
engine cooling fan.
By this time, the coolant level
inside the coolant surge tank
may be lower. If the level is
lower, add more of the proper
mixture to the coolant surge tank
until the level stabilises at the
cold fill line on the coolant
surge tank.
5. Replace the pressure cap tightly.
Check the level in the surge tank
when the system has cooled
down. If the coolant is not at the
proper level, repeat Steps 1 4,
then reinstall the pressure cap.
If the coolant is not at the proper
level when the system cools
down again, see the dealer.
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