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I've replaced a few pumps, plungers and lines for the mcp44 (i by far claim to be an expert dont misunderstand). However, this one is the first double pump. Though I've replaced them according to manual. am I to understand that maybe the "purge pump" is not working properly causing reservoir...

My sister's master cooler MCP44k is 4 years old. A about a month ago she had a friend come look at it before the summer starts. He opened it up and noticed the pumps are shot and lots of sand in reservoir he told her even if she got the cooler to work it would leak but never said why. Yesterday...