2010 Cadillac CTS Owner's Manual - Page 150

4-40 Instruments and Controls See Engine Coolant Temperature Gage on page 4‑20. To avoid added strain on a hot engine, the air conditioning compressor automatically turns off. When the coolant temperature returns to normal, the air conditioning compressor turns back on. You can continue to drive the vehicle. If this message continues to appear, have the system repaired by your dealer/retailer as soon as possible to avoid damage to the engine. This message displays when the engine coolant temperature is too hot. Stop and allow the vehicle to idle until it cools down. If the message does not clear in a few minutes or if the overheat light stays on, shut the vehicle off and have it serviced before driving again. See Engine Coolant Temperature Warning Light on page 4‑29. See Overheated Engine Protection Operating Mode on page 9‑24 for information on driving to a safe place in an emergency. Rear Access Open (Wagon) This message displays when the liftgate is not closed completely. Make sure that the liftgate is closed completely. Right Rear Door Open This message displays when the passenger side rear door is not closed completely. Make sure that the door is closed completely. Trunk Open (Sedan) This message displays when the trunk is not closed completely. Make sure that the trunk is closed completely. Engine Overheated Idle Engine Notice: If you drive your vehicle while the engine is overheating, severe engine damage may occur. If an overheat warning appears on the instrument panel cluster and/or DIC, stop the vehicle as soon as possible. Do not increase the engine speed above normal idling speed. See Engine Overheating on page 9‑23 for more information. Engine Oil Messages Change Engine Oil Soon When this message displays, it means that service is required for the vehicle. See your dealer/retailer. See Scheduled Maintenance on page 10‑3 and Engine Oil on page 9‑10 for more information. Engine Cooling System Messages Engine Hot A/C (Air Conditioning) Off This message displays when the engine coolant becomes hotter than the normal operating temperature.