GMC 2010 Sierra Owner's Manual page 496

How to Add Coolant to the Coolant
Surge Tank for Gasoline Engines
If the vehicle has a diesel engine, see Cooling System
®
in the DURAMAX Diesel Supplement for the proper
coolant fill procedure.
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.
6-36
Notice: This vehicle has a specific coolant fill
procedure. Failure to follow this procedure could
cause the engine to overheat and be severely
damaged.
WARNING:
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.