Hummer 2007 H3 Owner's Manual page 337

Checking Coolant
It is located toward the rear of the engine
compartment on the passenger's side of the
vehicle. See Engine Compartment Overview on
page 322 for more information on location.
The vehicle must be on a level surface. When
your engine is cold, the coolant level should be
at FULL COLD, or a little higher. When your
engine is warm, the level could be above the
FULL COLD level.
The coolant recovery
tank cap has this
symbol on it.
Adding Coolant
If you need more coolant, add the proper
®
DEX-COOL coolant mixture at the coolant
recovery tank.
CAUTION:
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Turning the radiator pressure cap when
the engine and radiator are hot can allow
steam and scalding liquids to blow out
and burn you badly. With the coolant
recovery tank, you will almost never
have to add coolant at the radiator. Never
turn the radiator pressure cap — even
a little — when the engine and radiator
are hot.
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