2010 GMC Acadia Owner's Manual - Page 334

10-18 Vehicle Care 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. Engine Overheating The vehicle has several indicators to warn of engine overheating. There is an engine coolant temperature gauge on the instrument panel cluster. See Engine Coolant Temperature Gauge on page 5‑13. The vehicle may also display an ENGINE OVERHEATED IDLE ENGINE and ENGINE OVERHEATED STOP ENGINE message in the Driver Information Center (DIC). See Warning Lights, Gauges, and Indicators on page 5‑10. You may decide not to lift the hood when this warning appears, but instead get service help right away. See Roadside Assistance Program on page 13‑6. 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). 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.