2004 Citroen C2 radiator fan sometimes doesnt work

On a lot of cars the fan often doesn't cut on till nearly in the red which is quite normal .

but indicator going to red and car signal overheating ?

If it's not cutting in at all after all that has been replaced , it only leaves the fan motor or the wiring to check .

i checked fan motor and wiring. i suspicion to bsi. what do you think ?

How can i check bsi output or what can i do ?

If you are worried about it , tap into the wiring and fit a manual flick switch which you could then use if fan does not kick in automatically .

allright thank you. i have a last question.
Where is location in my car ? i cant find this resistor location on internet
My car is : Citroen c2 1.4sx 2004
https://www.amazon.com/Resistor-9662872380-Radiator-Replacemet-Citroen/dp/B08BBZS6ZS

See if this applies to your car ,

https://www.heaterblowerresistor.co.uk/citroenc2c3c5heaterresistor.html#:~:text=To%20access%20the%20resistor%20pack,with%20two%206mm%20hex%20screws.

this is blower resistor .Does my problem have anything to do with this resistance? im searching radiator resistor location.

The link you posted is for the blower motor resistor .

Depends if its a mk1 or mk2 , later cars have a relay fastened to fan cowl ,early cars are controlled by engine Ecu/Bsi, Some models/ years had two temp sensors on gearbox side apparently

you are awesome thank you.
https://productimages.hepsiburada.net/s/6/375/9742984183858.jpg
my car have a relay and i understand i dont have need a 2. relay or resistor for radiator fan. i will check bsi wiring and socket.

Do you have a suggestion for me this issue ? Why reaseon sometimes doenst work radiator fan ? my brain is blowing

Because i was change ;
• termostat,
• relay,
• temperature sensor
• checked fan
• checked radiator
• reset bsi
• hot water circulates all hose