2009 GMC Acadia Owner's Manual - Page 309

Service and Appearance Care 5-23 9. If the coolant level inside the radiator filler neck is low, add more of the proper DEX-COOL coolant mixture through the filler neck until the level is back up to the base of the filler neck. Replace the pressure cap. Be sure to secure it tightly. 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. 6. Fill the coolant recovery tank to the FULL COLD mark. 7. Reinstall the cap on the coolant recovery tank but leave the radiator pressure cap off. 8. Start the engine and let it run until the upper radiator hose feels warm. Any time during this procedure, watch out for the engine cooling fan(s).