This is totally normal. All radiators contain an antifreeze/ antiboil component when filled as per manufacturers instructions. This stabilizers the temp of the coolant, reducing fluctuations in temperature. The thermostat is heat responsive. Basically a piece of spring steel heated to a temperature then cooled, so as to retain the memory of when to react. Replacing the water temp sensor on this occasion was probably unnecessary, tho in saying that, I have replaced mine & friends with beneficial results.
SOURCE: Peugeot 406 HDI 90 brakehorse Turbo Diesel The
it will or should be on top of the engine in the cylinder head area??
SOURCE: Peugeot 206 temperature gauge not working?
it could be a couple of things, first, check the wires to the temprature sender unit make sure they have not broke, as it was sudden this may be it, also it could be the sender unit it self as a freind of mine had with her car i changed that and the one for the radiator switch, but most of the time it will be something to do with the sender unit on the engine...hope this helps
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