GMC 2003 Savana Van Owner's Manual page 270

Add coolant mixture at the recovery tank, but be careful
not to snill it.
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engine parts. Coolant contains ethylene glycol,
and it will burn if the engine parts are hot
enough. Don't spill coolant on a hot engine.
Occasionally check the coolant level in the radiator. For
information on how to add coolant to the radiator,
see Cooling System on page 5-30.
The radiator pressure cap is located near the center
of
the engine compartment.
Notices Your radiator cap is a pressure-type cap
and must be tightly installed to prevent coolant loss
and possible engine damage from overheating.
5-27