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Has anyone played with coolant temp when the thermostate starts to open vs. where you turn on your cabin cooling fan. I try to wait till 140F before I start "extracting" heat into the cabin. It takes quite a long time for the engine temp to go from 160 to 170F probably because the thermostate is starting to open. So I run the cabin fan on high after it gets above 140 when it is really cold. If it is not too uncomfortable I wait till 170 since it is "free" at that point since the engine is already sending coolant through the radiator.
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