Radiator fan problem

Hi all,

I have C3 2003 1.4 , my problem with radiator fan is the fan is just running with the max speed and i didn't know where is the problem some people advice me to replace all Fan but it very expensive to try, is there another part cause this problem .

Thanks for your support .

Hi ahmedalmulki

ahmedalmulki wrote:Hi all,

I have C3 2003 1.4 , my problem with radiator fan is the fan is just running with the max speed and i didn't know where is the problem some people advice me to replace all Fan but it very expensive to try, is there another part cause this problem .

There are several different fan systems fitted to the C3. Some are quite simple and controlled by a relay - which could be the cause of your fan problem.

Another system found on the C3 is a multi speed computer controlled (by ECU) fan. This is more complicated. There could be an erroneous input to the ECU which is causing the fan to run.

Things to check would be the system is not actually too hot and there is coolant in the system, there is a temperature sensor in the engine which is much cheaper to replace, and to find out which system for the fan you have fitted.

You can use the fast find tool on Euro Car Parts to find the right temperature sensor.

Do you have air conditioning or climate control? and does it work?


This picture shows the ECU (computer) controlled, variable fan. It has 2 plugs on the fan.



If its an ECU driven fan, the best way to diagnose the fault is with lexia tool, which is also useful for the more simple systems, but a cheaper way would be to test the relay first.


If you had a relay, this is how you find it:

patt wrote:Hi, the cooling fan relay can be replaced without removing the bumper. Removing the n/s headlamp cap will show the relay and nut.
Removing some items nearby will improve access i.e. battery cover and fuse box lid. Open the trap door underneath and if there are no spotlights, remove the n/s bung. Yes, it's fiddly, but allowing the relay to fall with loom makes it easier to unplug. Attach string to the new relay to pull it up unto place and replace nut.
Just waiting for some warm weather......

petrol-citroen-c3/cooling-fan-again-t558.html

Thanks for your help, I have been changed the fan i buy used fan and replaced and all my problems was solved, before i cant use air conditioning but now yes and the speed is run with multi speed.
Thanks again.

ahmedalmulki wrote:Thanks for your help, I have been changed the fan i buy used fan and replaced and all my problems was solved, before i cant use air conditioning but now yes and the speed is run with multi speed.
Thanks again.

That is great news. Thank you for letting us know.