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    2012 PCM 6.0 ZR409 Overheating at high RPM

    We have a pair of 2012 ZR409s in a Tiara 31 Coronet. They both run fine up to 3,800 RPM then climb steadily and overheat. To date the impellers have been changed along with one new raw water pump, the thermostat(s) have been checked, removed and swapped, the heat exchangers boiled and the...
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