Thermostat, Time to replace Options

[fran]

So, i must replace the thermostat from my 4th gen 3S-GTE. I was doing some research around the web and i found the part number for this thermostat, is: 90916-03100. This one can be found in the 2UZ-FE, 3SGE from 94-99 Celicas, from the ST205 3S-GTE (94GT-Four) and from the Caldina ST215 4th gen 3S-GTE. I found those engines that shares the same thermostats! i dont know if another engine use the same one.
The 90-93 3SGTE (2nd Gen) do not share the same thermostat!.

I just post it for the record! and to give a little info

Fran

[delusionz]

The thermostat stays shut by a spring, and there's a diaphragm filled with wax inside it. The wax expands to a certain point with heat causing it to push open the thermostat letting cool water pass through.

After a good overheating or boilover, an old thermostat can get stuck (in most cases stuck in the open position) thereby constantly cooling the engine and not regulating the temperature. This means when the car is moving, a big flow of air across the radiator brings the temperature right down, and the thermostat can't close to compensate, you'll also notice the heater doesn't work because the engine is always cold.