62 Ford Thunderbird. Sprung a leak in a small diameter and very short (2" or so) hose that ran directly between the water pump and the engine block. Probably some kind of bypass? Easy job. Had to cut it off to remove it, and discovered that there was only about 3/8" clearance between the nipple on the water pump and the nipple on the engine. To get enough clearance to get the hose on required removing the water pump, which required removing the radiator and fan. There may have been some other pieces involved; it was a long time ago. Engineering at its finest.
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