Chevrolet 2011 Express 1500 Cargo Owner's Manual page 292

If the vehicle has a diesel engine,
see How to Add Coolant to the
Coolant Recovery Tank under
Van Models in the Cooling System
section of the Duramax diesel
supplement for the proper coolant
fill procedure.
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.
If coolant is needed, add the proper
DEX-COOL coolant mixture at the
coolant recovery tank.
If the vehicle has a diesel engine,
see How to Add Coolant to the
Radiator under Van Models in
the Cooling System section of the
Duramax diesel supplement for
the proper radiator fill procedure.
An electric engine cooling fan
under the hood can start up even
when the engine is not running
and can cause injury. Keep
hands, clothing, and tools away
from any underhood electric fan.
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
mixture directly to the radiator, but
be sure the cooling system is cool
before this is done.