2010 GMC Savana 2500 Cargo Owner's Manual - Page 129

Fast Idle System Fast Idle System with Switch 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: 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 Cancel button. Releasing the Parking Brake. The transmission shifter is moved out of P (Park) or N (Neutral). was previously on. • The park brake is set. • The brake pedal is not pressed. • The vehicle must not be moving and the accelerator must not be pressed. To control the fast idle: • Selecting the cruise control on/off button when it Engine Coolant Heater If the vehicle has the DURAMAX Diesel engine, see the DURAMAX Diesel manual 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 0°F (−18°C). 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 0°F (−18°C). • To Enable the Fast idle, press and release the Cruise Control On/Off button and ensure that the LED is lit. • For the preset Fast Idle, press and release the cruise set switch. This will set the preset fast idle speed. • For the variable fast idle, press and hold the accelerator at the desired RPM, then press and release the cruise control cruise set switch to set the desired idle speed. 3-25