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!
Twingo II 1.2. operating coolant temperature too high ?
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