seemed ok to me , I can also understand why fitting the lower thermostat, will keep the head temp down , as the stat is sensing the block temp lower in the engine which would be lower than head temp , it may be that the head temp is getting above the flashboil point with a hightemp, low fitted thermostat. This would be most likely when working very hard . toyota must have a reason for fitting the thermo where it is but could be due to emissions as that seems to govern most things these days .
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