well if you are me and you have an old 74 merc then you replace it once a year if you are lucky, the impeller/gaskets was 15 bucks the whole water pump kit was 105 if i remember correctly. Not that hard to replace yourself. Took me about 2 hours the first time and I had no idea what I was doing. (second time the motor caught on fire but thats a story for another time)
Thermostat was pretty easy too. Just make sure you have all the gaskets.
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