I had problems with running hot using the Wieand water pump until I took it off and drilled the bypass hole.
If you use the Cleveland thermostat you MUST HAVE the bypass hole drilled in the water pump.
The Wieand pump is not drilled and is intended to be used with the Windsor type of thermostat.
Wieand will give you the, "there is nothing wrong with our Cleveland pump, we have been making it for years" speech.
Confused enough yet? I can do better?
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