2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 465

Fan and Drive: • Removal of fan clutch, if the vehicle has one, or rendering clutch inoperative. If oncoming vehicles flash their high beams at you, this can mean the vertical aim of your headlamps needs to be adjusted. It is recommended that the vehicle is taken to your dealer/retailer for service if the headlamps need to be adjusted. It is possible however, to re-aim the headlamps as described. The vehicle should: • Removal of the fan shroud, if the vehicle has one. Air Intake: • Removal of the air cleaner silencer. • Modification of the air cleaner. Exhaust: • Removal of the muffler and/or resonator. • Removal of the exhaust pipes and exhaust pipe clamps. • Be placed so the headlamps are 25 ft. (7.6 m) from a light colored wall. • Have all four tires on a level surface which is level all the way to the wall. Headlamp Aiming The vehicle has a visual optical headlamp aiming system. The aim of the headlamps have been preset at the factory and should need no further adjustment. However, if the vehicle is damaged in a crash, the aim of the headlamps can be affected and adjustment can be necessary. • Be placed so it is perpendicular to the wall. • Not have any snow, ice, or mud on it. • Be fully assembled and all other work stopped while headlamp aiming is being performed. • Be normally loaded with a full tank of fuel and one person or 160 lbs (75 kg) sitting on the driver seat. • Have tires properly inflated. • Have the spare tire is in its proper location in the vehicle. 5-55