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Sounds like a dumb design doesn't it? The Bendix unit is a "fail safe" design. Since the clutch is spring loaded to engage, loss of air pressure for any reason results in the fan being on. If air is required to engage the fan, loss of air pressure results in the fan being off which would...

Thanks. It locks up very quickly. Didn't start it up for 6 months and it locked up again even though we're in California with dry air so there should be minimal rust. Only good thing is it didn't cost anything to fix. Just be careful not to ruin the o-rings or damage the bearings.

I don't know the slightest thing about Cats, but my Cummins M916A1 had the same problem. I assume all the trucks use the same air clutch made by Bendix. How it works is there is a spring loaded cone clutch that presses against the inside of the fan pulley locking the fan hub to the fan pulley...