The fan clutch on the 98 Pete 377 that I'm driving is audibly leaking air when it's engaged. I'm guessing that this is a good indication that it's time to consider replacing it. Any ideas on a ballpark cost? I seem to recall hearing that the clutch itself is around $600, plus labor. Engine is a Detroit 60 series, 250,000 original miles.
Can it be something as simple as a seal? I'm thinking that it would take as much if not more labor to rebuild than to replace.