King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge
Which symptom points to a failing heavy-duty pneumatic fan clutch?
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Pneumatic fan clutches use air pressure or springs to engage the engine cooling fan. If it leaks air or fails electrically, the clutch will lock permanently, creating a continuous loud roaring noise as the fan spins at engine speed.
Which symptom points to a failing heavy-duty pneumatic fan clutch?
Frequent compressor purge emissions
A continuous loud roaring noise from under hood
Excess carbon build-up in the DEF tank
Sluggish automatic split shift timing
90%
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