Cadillac 2002 DeVille, Owner'S Manual

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Checking Coolant
The engine coolant surge tank is located toward the rear
of the engine compartment on the passenger’s side of
the vehicle. For more information on location, see
“Engine Compartment Overview” in the Index.
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 FULL
COLD mark, located on the side of the surge tank that
faces the engine.
If the CHECK COOLANT LEVEL message comes on
and stays on, it means you’re low on engine coolant.
For more information, see “Check Message, Coolant
Level” in the Index.