That looks like on e of the Prince engine variants. The temperature sensor is in the thermostat housing and is (probably) not a separate part.
There are several different versions for different variants of that engine, some have 2 temperature sensors and some have only one.
Here are photos of 2 variants:
I think that yours may be similar to the lower one in the photo, but without the extra cable and temperature sensor which is screwed into the bleed hole. In this case, the temperature sensor (and heating element) are inside the plastic body where the cable is plugged in at the right hand side.
The upper thermostat is the picture is the other main type which has separate temperature sensor at the top left, held in with a clip, but this sensor is not officially available as a separate part or replaceable (but is available from sources in China).
If your sensor is faulty, you have to replace the whole part, which is a fiddly job. Be very careful to buy the correct one for your car as there are at least 6 incompatible variants, which to some suppliers look all the same.
