Check the left-hand radiator tank about 3 inches above the lower hose. I had mine crack there and it would suck air into the pump on short cycles after highway driving (then it shit the bed) I hit 110c that time and shut it down RFN, it looked like the thermometer from the Riddick movie....

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course