2013 Chevrolet Express 1500 Cargo Owner Manual - Page 208

9-18 Driving and Operating To control the fast idle: . . Notice: If you add electrical parts or accessories, you could change the way the engine operates. Any resulting damage would not be covered by the vehicle warranty. See Add-On Electrical Equipment on page 9‑57. To enable the Fast Idle System, press and release the cruise control on/off button and ensure that the switch indicator light is lit. Press and release the cruise control SET-button. Engine speed will be held at approximately 1200 RPM. Pressing the cruise control SET-button a second time. Pressing the accelerator greater than a quarter of the way down. Turning the ignition switch to the LOCK/OFF position. . . . Fast Idle System If the vehicle has this feature it is available only with cruise control. The manual fast idle switch is operated using the cruise control buttons located on the left hand side of the steering wheel. This system can be used to increase engine idle speed whenever the following conditions are met: ... Engine Heater If the vehicle has a diesel engine, see the Duramax diesel supplement for more information. The engine coolant heater can provide easier starting and better fuel economy during engine warm‐up in cold weather conditions at or below −18°C (0°F). Vehicles with an engine coolant heater should be plugged in at least four hours before starting. An internal thermostat in the plug-end of the cord may exist which will prevent engine coolant heater operation at temperatures above −18°C (0°F). When the fast idle is active the Driver Information Center (DIC) will display "FAST IDLE ON." One of the following actions will turn off the fast idle: . . Pressing the brake. Selecting the cruise control cancel button. Releasing the parking brake. The transmission shift lever is moved out of P (Park) or N (Neutral). Selecting the cruise control on/ off button when it was previously on. The parking brake is set. The brake pedal is not pressed. The vehicle must not be moving and the accelerator must not be pressed. . . .