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The transmission will cool things a little bit, but I don't think it has nearly enough surface area to really cool the engine down... Of course, it is pretty easy to cool the engine down in the Insight in winter by blasting the heat. In any case, the trans warmer will activate at a lower temp than the thermostat, so we should be able to see how it effects the coolant temp. That set point is fully adjustable, so I can play with it. I can also open the heater valve variably to get a little flow or a lot of flow. Lots of variables to play with.
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