2009 Buick Lucerne Owner's Manual - Page 319

3. Fill the cooling system with the proper DEX-COOL coolant mixture, up to the base of the filler neck. See Engine Coolant (4.6L Engine) on page 5-27 or Engine Coolant (3.9L Engine) on page 5-31. 4. Then fill the coolant recovery tank to the COLD FILL line. 5. Install the coolant recovery tank cap and the pressure cap. After a day or two of driving, when the engine is cold, check the coolant level in the recovery tank. If it is low, refill it to the COLD FILL line. If the coolant in the recovery tank is constantly low, you should have a dealer/retailer service department inspect the vehicle for leaks. Notice: If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. Radiator Pressure Cap Notice: The radiator cap on your vehicle is a pressure-type cap and must be tightly installed to prevent coolant loss and possible engine damage from overheating. Be sure the arrows on the cap line up with the overflow tube on the radiator filler neck. See Engine Compartment Overview on page 5-14 for more information on location. Coolant Surge Tank Pressure Cap Notice: If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. See Engine Compartment Overview on page 5-14 for more information on location. 5-35