In order to keep to the federal exterior noise regulations, your vehicle may be equipped with noise emission items. Depending on your vehicle configuration, it may have all or some of the following items:
Air Intake System
Inspect the air cleaner. Do not alter its location. Do not alter inlet and outlet piping.
Body
Inspect wheel well splash shields, cab shields and under hood insulation for deterioration, dislocation and orientation.
Cooling System
  • Inspect the fan for blade damage. If you find any damage, replace with the recommended parts. Inspect for fan-to-shroud interference and any damage to shroud, such as cracks and holes.
  • Do not change fan ratio or alter fan spacer dimensions and positions.
  • Inspect fan clutch for proper operation. Make sure the fan is disengaged when cooling of the engine is not required.
  • Inspect radiator shutters (if equipped) for proper operation. The shutters should be open during normal operating temperatures.
Engine
Valve covers and block covers damp-out engine mechanical noise. If they need replacing, make sure to replace them with the recommended parts. Check for mechanical isolations.
Transmission Enclosure
Inspect for cracks, holes and tears. Clean any deposits, such as oil, dirt and stones.
Exhaust System
  • Inspect for leaks at various joint connections and loose clamps.
  • Perform a visual inspection for cracks or holes in the muffler and tail pipe.
  • Always use the recommended replacement parts.
  • Do not change the tail pipe elbow or offset tail pipe orientation from the standard position as originally received.
  • To avoid abnormal changes in vehicle sound levels, it is necessary for the owner to perform inspections and necessary maintenance at specified intervals.   See   Scheduled Maintenance. 

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