I work with pumps all the time. they really are pretty simple. If the impellor turns, it is going to work. The problems are bearings and the seals. Loose either and its gonna leak.
All the symtoms you describe sound like the fan clutch to me. Might not be that much more work to do the water pump while changing the clutch. The pump on my Nissan was only about 15 bucks and took about 20 minutes to change. Spent most of a Saturday once changeing the pump on a Crown Vic. I guess I would depend on how long you plan to use it.
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