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another basic observation
If the engine is very hot after a climb but not hot enough to trigger the radiator fan and if the heater has been selected for "hot" already so that coolant is circulating through the heater core, when I cut the engine to coast a long straight or downhill I can take all the heat out of the heater core in under one minute by running the cabin fan at top speed setting, temp selector on hot. Air starts out hot, but gets cool in 30 seconds or so. When I next restart the engine, that small amount of cooled coolant begins to circulate in the system again as the water pump starts-up, bringing the overall coolant temp down slightly.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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