I’m trying to understand why you tie the thermostat together with the water pump? How could a faulty thermostat cause a leak in the water pump? Unless of course the stat caused over-heating and blew a hose or seal or something. So no it is not a thermostat issue but why would you not replace a 16 year old thermostat when you are working on the cooling system? I replaced my 4 year old one as a preventative measure. So the answer is no.
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