Buick 2003 Century Owner's Manual page 241

Checking Coolant
The engine coolant recovery tank is located on the
passenger's side of the vehicle at the rear of the engine
compartment. See Engine Compartment Overview on
page 5-12 for more information on location.
The vehicle must be on a
level surface. When your
engine is cold, the
coolant level should be at
the COLD mark or a
little higher. When your
engine is warm, the
level should be up to the
HOT mark or a little higher.
Adding Coolant
If you need more coolant, add the proper DEX-COOL@
coolant mixture at the coolant recovery tank, but be
careful not to spill it.
If the coolant recovery tank is completely empty, add
coolant to the radiator. See "How to Add Coolant to the
Radiator" later in this section.
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.
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. Don't spill coolant on a hot engine.
I
Occasionally check the coolant level in the radiator.
For information on how to add coolant to the radiator,
see Cooling System on page 5-28.
5-24