2007 Cadillac XLR-V Owner's Manual - Page 396

If the LOW COOLANT message does not appear on the Driver Information Center (DIC) after two minutes, the coolant is at the proper fill level. If a LOW COOLANT message does appear, repeat Steps 1 through 3 then reinstall the pressure cap, or see your dealer. Power Steering Fluid See Engine Compartment Overview on page 374 for reservoir location. 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. 396