Cadillac 2003 DeVille Owner's Manual page 306

4. With the coolant surge tank pressure cap off, start
5. Then replace the pressure cap. Be sure the arrow
the engine and let it run until you can feel the upper
on the pressure cap lines up like this.
radiator hose getting hot. Watch out for the
Start the engine and allow it to warm up. If the CHECK
engine cooling fans.
COOLANT LEVEL message does not appear on the
By this time, the coolant level inside the coolant Driver Information Center, coolant is at the proper
surge tank may be lower. If the level is lower, add
fill level. If a CHECK COOLANT LEVEL message does
more of the proper mixture to the coolant surge
appear, repeat Steps
1
to
3
and reinstall the pressure
tank until the level reaches about 4.5 inches
cap or see your dealer.
(1 1.4 cm) from the top of the filler neck.
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