Twingo II 1.2. operating coolant temperature too high ?

[StefanoCola]

Hello,
on my 2011 Twingo 1.2 75 cv - Engine type CN01 (also known as 770 I believe) I found out that there is an electronic thermostat which opens mechanically at 108 C, and only in case of high load opens fully with an electrical impulse. The OE number is 8200400294 ( https://www.autodoc.co.uk/car-parts/oem/8200400294 )

While on many other Twingo ( and Clios, Modus, ect..) with same engine 1.2 aspirated but different codes CN04 / CN0B / CN0K / CN0V / CN0A (known as 772) - there is a different thermostat, I believe non electronic, which ''normally'' opens at 89 C. OE number 8200660882 ( https://www.autodoc.co.uk/car-parts/oem ... 8200660882 ).
By looking at its shape, this 89 C thermostat looks not compatible with my car.

108 C opening temperature is compatible with what I verified with an OBD reader: after engine is warmed up, cruising at low or medium load and RPM, the coolant temperature fluctuates between 111 and 100-ish in winter, or between 111 and 105-ish in summer. In the highway as I reach 130 km/h - 3200 rmp , or uphill at 100 km/h ( low RPM but higher load ) the temperature suddenly drops to 60 or 70 C, depending on external temperature.

Also the car has LPG system installed which compared to petrol might raise the temperature in the combustion chamber a little.
So my question is: is 110 degrees too much? did Renault make this CN01 version to have better fuel economy sacrificing the engine life span ?
If it makes sense to reduce the coolant temp, do you know a solution?

Thanks a lot!

[Mihael_M]

Hello Stefano, you have researched the existing behavior of your thermostat very well. It is a trend in the auto industry to use new solutions that are more complicated and expensive. I don't know exactly either, but it's certainly related to having better fuel economy sacrificing the engine. On this page from Autodoc, you can see that you can select 2 types of thermostats, 89 and 108 C. This one from 108 C has a temperature sensor and a connection to the ECU. This one from 89 C could be mounted, but then the setting in the ECU would have to be changed. It doesn't make sense to me that the engine works constantly at a higher temperature, but it seems that the constructors decided that it is better.
https://www.autodoc.co.uk/car-parts/the ... omSearch=1

[Joe84]

As i know D4F and D7F use 89C
But based on Cat car online parts) recomended both of them. But have diff.
8200400294 old typ 89C Engine code before 090925
8200660882 new type 108C Engine code after 090925

I have D7F and winter every time problem, over colling. Reach 89C and open...And warm water go out and very cool comes back...in right side corners. And Temperature immediatelly decrease to ~60 (at sensor)
And my Clio 2 ph dashboard 4 stripe -> 2 stipe change
Maybe Renault improve this problem with better controlled Thermostat.