3 of the same failures, with in a year qualifies as a lemon.
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Depends on the state most require the issue to occur within the first 90 days of purchase. Plus they bought used which very few states have any lemon laws for used vehicles.
As for feeling bad for the dealer, DON’T.
3 water pump replacements in a years. I would not have taken it back to them for the 3rd time.