Cadillac 2011 DTS - Manual (Page 330)

Black plate (28,1) Cadillac DTS Owner Manual - 2011
Turn the pressure cap slowly counterclockwise.
If you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.
2. Keep turning the cap and remove it.
3. Fill the coolant surge
tank with the proper
mixture to the FULL
COLD mark on the side
of the coolant
surge tank.
4.6L L37 Engine shown, 4.6L LD8 Engine similar
4. With the coolant surge tank cap off, start the
engine and let it run until you can feel the upper
radiator hose getting hot. Watch out for the engine
cooling fans.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge
tank until the level reaches the FULL COLD mark
on the side of the coolant surge tank.
5. Replace the cap. Be sure the cap is hand‐tight and
fully seated.
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