DS5 180 BlueHDi 2016 Overheats on highway speed only

[kristiantot]

Hello!

For a while now my car is overheating when I drive at highway speeds.
The dash temperature is stable at 90c but after I reached aprox 130kmh it starts to increase really fast in like 4 seconds it goes to maximum and when I release the gas pedal it quickly drops back to 90c, again in few seconds.
We replaced the Thermostat, last year we replaced the timing belt and also the water pump. The collant is bleeded there is no air or extra pressure in system. The Fan is working.
No error codes!
What could be the issue?

[PaulC5]

Possibly the coolant temperature sensor or its wiring/connector are faulty. If you have a code reader that does live data see what the sensor shows.

[kristiantot]

Solved in the dealer service. The water pump propeller completely detached. The pump was almost new, the manufacturer was INA.