[Matthieu]

Hi there,

My thermostat failed so I had to change it. In fact, I was not able to monitor the coolant temp and the fan started as soon as I started the car.

I installed a whole new one (thermostat and sensor). However, the thermostat maintains the temperature too hot, about 108°C (226-228F). The fan starts at 108°C (226-228F) and stops at 104°C (219F) when I shut down the engine 30 seconds later at least. It seems to be a common issue because some of thermostat are inaccuracy. They should work at 104-105°C (219-221F). The main issue is that the fan is always running when I'm driving, because of this thermostat that maintains the temperature at 108°C (226-228F).

I don't want to change one more time my thermostat because maybe I will have another one with this problem.

Is there a way to flash/program the ECU to modify the coolant operating temperature ? I mean reducing the operating coolant temp at something like 102°C (215F) to be sure that the fan will not start for no reason.

Thank you very much for your help

Matthieu