Buick 2008 Lucerne Owner's Manual page 295

Checking Coolant (4.6L V8 Engine)
For more information on location, see Engine
Compartment Overview on page 5-12.
CAUTION:
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Turning the surge tank pressure cap when the
engine and radiator are hot can allow steam
and scalding liquids to blow out and burn you
badly. Never turn the surge tank pressure
cap — even a little — when the engine and
radiator are hot.
The engine coolant surge
tank is located toward the
rear of the engine
compartment on the
passenger's side of the
vehicle.
The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at the FULL
COLD mark, located on the side of the surge tank
that faces the engine.
Adding Coolant
If you need more coolant, add the proper DEX-COOL
coolant mixture at the coolant surge tank, but only
when the engine is cool.
CAUTION:
{
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.
Occasionally check the coolant level in the radiator. For
information on how to add coolant to the radiator,
see Index. When replacing the pressure cap, make sure
to turn cap until it clicks.
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