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Hi, not clear to me your routing of the heater hoses. I’m not familiar with 140’s but on 122’s and 1800’s the routing is out of the back of the head, to the inlet of the heater core, then from the outlet of the heater core to the valve. From the valve to the long pipe that connects to the water pump. I have a hard time imagining that a B20 140 would be different.
No idea if this could have any effect on how hot the engine gets, but thought I’d point this out.
Will be interested in hearing when you get the problem sorted.
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