AIR INTAKE SYSTEM PART 8: MAINTENANCE AND SERVICE
– 188 – Y53-6007 (R10/06)
Fan Clutch / Fan
WARNING! Engine fans engage suddenly
without warning and can badly hurt you. Stay
away from the fan when the engine is running.
Your truck may be equipped with an On/Off or Viscous
Fan Drive. Follow these guidelines to check your engine
fan:
• Check the fan assembly mounting bolts for tightness.
Inspect the fan blades for damage.
On/Off Fan Drives - Check the clutch operation by starting
the engine when it is cold. Idle the engine at about 800
RPM. Listen for air leaks. Check that the fan is not work
-
ing while the engine is warming up. When the clutch
engages, note the reading on the vehicle's panel-mounted
coolant temperature gauge. If the fan clutch engages at
low engine temperature or cycles on and off more fre
-
quently than it should (receives "false signals"), have the
problem corrected at your dealership.
Air Intake System
Engine heat, vibration, and age combine to loosen air
intake connections and cause cracks in the tubing and
elbows. Leaks in the intake system allow abrasive dust to
enter the engine and quickly cause expensive damage.
During your daily walk-around inspection, carefully check
all tubing, elbows, clamps, supports, and fasteners for
condition and tightness.
Under normal operating conditions, we recommend com-
plete disassembly and cleaning of the air intake system
annually.
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