Oldsmobile 2001 Aurora - Manual (Page 283)

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Checking Coolant
The engine coolant surge tank is located on the
passenger’s side of the engine compartment. See
“Engine Compartment Overview” in the Index for more
information on location.
CAUTION:
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 vehicle must be on a level surface. When your
engine is cold, the coolant level should be at the base of
the filler neck.