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My guess is air in the system caused the puke after the engine was shut down at the end of a hot day. I didn’t let the fans cycle off before shutting it down.
My pump looked ok but removing the belt and putting some force on it I could hear and feel play. Plastic impeller looked new after almost 20 years. Bearing not so much. A few drops of coolant and dried residue at the bottom showed it had leaked. I didn’t check the original OEM thermostat as I was changing it anyway. Physically it looked fine. As far as I was concerned I had found my culprit so didn’t heat water to check it’s functioning.
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