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Message: <blockquote data-quote="Mad Dog 2" data-source="post: 522196" data-attributes="member: 35614">You should be able to hold the end of the garden hose against the thermostat housing opening and back flush the cooling system down and through the water pump supply tube with lower unit disconnected. If you catch the discharged  back flushed water you may see trash and bits and pieces of all impellers from the last 41 years. I had problems with my out board the raw water pump worked well in a tank. The square muffs with hard plastic cups the water pump could not pull a vacuum and pump water. I then made sure the muffs were center on the pickup screen and then used bungee cords to squeeze the plastic cups down and seal then it started pumping.</blockquote>