Cadillac 2004 Seville - Manual (Page 285)

Checking Coolant
The engine coolant surge tank is located in the engine
compartment on the driver’s side of the vehicle. See
Engine Compartment Overview on page 5-12 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 FULL
COLD mark, which is at or above the fill mark at the
forward edge of the surge tank.
If the CHECK COOLANT LEVEL message comes on
and stays on, it means you are low on engine coolant.
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