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Message: [QUOTE="pesky nz, post: 1405380, member: 120687"] I've also chased my tail on a boiling KDX and it turned out to be a partly loose water pump impeller and as the motor got hotter the impeller got looser and the coolant did not cycle as well and the boiling began. The bolt holding the impeller on had thread lock so the bolt felt tight enough but the impeller could be turned by hand (just) without the crank moving. Don't swing on the impeller as it is driven by relatively small shaft and gears [/QUOTE]