GMC 2008 Savana Van Owner's Manual page 272

How to Add Coolant to the Radiator for
Gasoline Engines
If your vehicle has a diesel engine, see "How to Add
Coolant to the Radiator" under "Van Models" in the
Cooling System section of the DURAMAX
Supplement for the proper radiator fill procedure.
1. You can 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.
5-32
2. Then keep turning the pressure cap, but now push
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Diesel
3. Fill the radiator with the proper DEX-COOL
If you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.
down as you turn it. Remove the pressure cap.
coolant mixture, up to the base of the filler neck.
See Engine Coolant on page 5-23 for more
information about the proper coolant mixture.
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