2009 GMC Acadia Owner's Manual - Page 163

Instrument Panel 3-41 Engine Coolant Temperature Gage Tire Pressure Light United States Canada This gage shows the engine coolant temperature. Under normal driving conditions the gage will read approximately 210°F (100 °C) or less. If the gage pointer is near 260°F (125 °C), the engine is too hot. It means that the engine coolant has overheated. If the vehicle has been operating under normal driving conditions, pull off the road, stop the vehicle and turn off the engine as soon as possible. See Engine Overheating on page 5-24 for more information. If the vehicle has a tire pressure monitoring system, the tire pressure light provides information about tire pressures and the Tire Pressure Monitoring System. The light should come on briefly as the engine is started. If it does not, have the vehicle serviced by your dealer/ retailer. When the Light is On Steady This indicates that one or more of the tires are significantly underinflated. A tire pressure message in the Driver Information Center (DIC), can accompany the light. See DIC Warnings and Messages on page 3-58 for more information. Stop and check the tires as soon as it is safe to do so. If underinflated, inflate to the proper pressure. See Tires on page 5-37 for more information. When the Light Flashes First and Then is On Steady This indicates that there could be a problem with the Tire Pressure Monitor System. The light flashes for about a minute and stays on steady for the remainder of the ignition cycle. This sequence repeats with every ignition cycle. See Tire Pressure Monitor System on page 5-44 for more information.