GMC Savana 2016 Owner's Manual page 228

If coolant is needed, add the proper
mixture directly to the radiator, but
be sure the cooling system is cool
before this is done.
1. Remove the radiator pressure
cap when the cooling system,
including the radiator pressure
cap and upper radiator hose, is
no longer hot. Turn the
pressure cap slowly
counterclockwise until it first
stops. Do not press down while
turning the pressure cap.
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,
but now push down as you turn
it. Remove the pressure cap.
3. Fill the radiator with the proper
DEX-COOL coolant mixture, up
to the base of the filler neck.
See Recommended Fluids and
Lubricants 0 303 for more
information about the proper
coolant mixture.
Vehicle Care
4. Fill the coolant recovery tank to
the COLD FILL mark.
5. Reinstall the cap back on the
coolant recovery tank, but
leave the radiator pressure
cap off.
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