See also:

Manual Operation
(Power): Press to turn the climate control system on or off. (Fan Control): Turn to increase or decrease the fan speed. Adjusting the fan speed while in automatic mode places the fan under ma ...

Engine Oil
For diesel engine vehicles, see “Engine Oil” in the Duramax Diesel Supplement. To ensure proper engine performance and long life, careful attention must be paid to engine oil. Following these si ...

Special Application Services
○ Severe Commercial Use Vehicles Only: Lubricate chassis components every 5 000 km/ 3,000 mi. ○ Have underbody flushing service performed once a year. ...