The radiator fan only works when the air conditioner is turned on
2004 Citroen C2 1.4sx

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Derek
Driver
2 points

Problem added: May 24, 2021 (3 months ago)
Hello , The radiator fan only works when the air conditioner is turned on.

If I do not turn on the air conditioner, the fan never works while driving and the car gives an overheating warning.

After overheating, I open the hood, I disassemble and install the fan relay and the fan is running.
Car: Citroen C2
Variant: 1.4sx
Model Year: 2004
Category: Engine & Drivetrain
Electrics, ECU, Warnings & Lights
Replies and Fixes
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Derek
Driver
2 points

May 24, 2021 (3 months ago)
Bsi error messages : Cooling function failure integrated in the engine calculator
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whittingehame
Legend
21,075 points

May 24, 2021 (3 months ago) Edited on May 24, 2021 (3 months ago)
Try changing the fan relay and any engine coolant fan sensor .Could also be the fan not operating on lower speed .
Avatar
Derek
Driver
2 points

May 24, 2021 (3 months ago)
Replying to post by whittingehame:
Try changing the fan relay and any engine coolant fan sensor .Could also be the fan not operating on lower speed .
i changed fan relay ,other sensors and thermostat.
if i turn on air conditioner, radiator fan starting lower speed and car is not overheating all day.

How i check lower speed in a different way?
Avatar
whittingehame
Legend
21,075 points

May 24, 2021 (3 months ago)
This explains how you can test fan operation .

" I've experienced an overheating problem, which I think is because of the radiator fan. The fan seems to work only on the high speed and no low speed. As far as I know it is supposed to be a 2 speed fan, because of the AC. I connected my car to Lexia and went on the Test options where I was able to find "High speed fan test" and "Low speed fan test". On the high test, the fan turns on and everything seems to be okay, while on the low speed test, the fan doesn't turn on at all. I can hear the relays(or some clicking noise) that activate the fan in both cases, but the fan only works on High. Also, there is an option which is "variable speed fan (chopper) test", and I can also change the fan type from the settings(there are 3types available - 1 speed fan(NO AC), 2/3speed fan(ac) and that's the one chosen by default, and Variable speed fan (chopper). When I change the type to Variable speed fan, the fan starts working and never turns off(even when the key is out and car locked), but the Variable speed test(chopper) seems to perform correctly - starting from high speed and then decreasing the speed."
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