Car Thermostat has 3 diff coloured sensors (green,blue & brown) What do they all do?

Danny_G

For the Peugeot 406 SALOON 2000, petrol.

The thermostat housing has 3 different coloured sensors coming in to it, green, blue, and brown.

What are each of these, and their job ??

One is the engine temperature sensor,
which shows you the on the dashboard, the temperature of the engine

Here are pictures.




What does the green one do?

What does the blue one do?

What does the brown one do?

Thank you.


For my past threads, and past forum posters to my threads. the thermostat has been changed to a new one, fluctuations stopped. Thanks.

BeenThroughItAll

Danny_G wrote: »

For the Peugeot 406 SALOON 2000, petrol.

The thermostat housing has 3 different coloured sensors coming in to it, green, blue, and brown.

What are each of these, and their job ??

One is the engine temperature sensor,
which shows you the on the dashboard, the temperature of the engine

Here are pictures.




What does the green one do?

What does the blue one do?

What does the brown one do?

Thank you.


For my past threads, and past forum posters to my threads. the thermostat has been changed to a new one, fluctuations stopped. Thanks.

So new stat and the temperature is now ok... So why does it matter what the sensors do?

ohreally

Danny_G wrote: »

One is the engine temperature sensor,
which shows you the on the dashboard, the temperature of the engine

I would doubt it shows engine temp, more likely it will be coolant temp.

At a guess their function, signals to gauge, cooling fan and ECU.

Browntoa

Blue is temperature

Browntoa

Green is coolant temperature

George_Michael

The blue sensor feeds the temperature gauge, green feeds the ECU and brown is for the cooling fan. (assuming that this https://www.thepeugeotforums.com/threads/406-cooling-fan-which-sensor.3229/ is correct)