2009 Cadillac XLR-V Owner's Manual - Page 346

3. Fill the coolant surge tank with the proper mixture until the level inside the coolant surge tank stabilizes at the FULL COLD mark on the front of the coolant surge tank. 4. With the coolant surge tank pressure 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 fan. 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 stabilizes at the FULL COLD mark on the coolant surge tank. 5. Then replace the pressure cap. Be sure the cap is hand-tight and fully seated. 6-26