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When the water pump "went" on my 01S, the clunk sound I heard was the pulley separating from the water pump shaft. This led to the dash lighting up like a Xmas tree because the car was running on the battery since the belt was no longer spinning the alternator. I shut things off within a minute and the temperature gauge remained at 180.
Is it possible that your spouse drove the car after the sound until the battery died? If so, this might explain why the engine shut off. If not, I'd guess something more serious has happened. The pulley falling off the shaft of and by itself should not shut the engine down
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