Ironically I get the oppsite effect. When my car is cold, putting the selector on hot seems to heat it up quicker (judging by distance travled before it hits 130F for 4th gear to kick in). I always leave the fan off. Factory my car came with a 180 thermostat, and I installed a 195 one, so maybe the hole in the thermostat is too big and not letting the engine get up to temp quickly. The 180F thermostat was stuck open, can't really comapair sadily when it always ran around 130-140F lol.
Now if I turn the fan on, or allow fresh air in while selected to hot, it will cool the engine pretty quickly down to around 185F from ~198-203.
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