I made the same repair when ours did the same thing a while back. The water pump has a check valve, and that is what failed. By installing another check valve, it takes over for the failed one in the water pump. If you ever have a need to replace the water pump, there will be no reason to remove the extra check valve. The photo below shows the check valve added in the lower left of the photo.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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