The heat design for the 3S-GTE is not designed for lang and hard runs, so I decided to install a better radiator, with cap, and an colder thermostat. The stock thermostat is an 82°C one. With the Autronic I can see that the coolant temp is almost never coming below 88 - 90°C. That is normal, because the range of the stock thermostat is 82 - 92°C.
This is how it comes from TRD. The gasket needed for the swap is included.... I did not know that, so I already did have a spare gasket... sigh
Close up from the thermostat. You can see the "71°C" stamped in the thermostat.