n16 1.8 petrol auto. cooling fan stays on at all times

hi. just noticed that my cooling fan stay on at all times. i replaced a coolant temp sensor, checked a fan relay. still on. run out of things to check. if anyone have any ideas help would be appreciated. thanks.
 
It may be an earthing problem. Cooling fans tend to fail positive so that of there is a problem then you can still drive the car, albeit with the fan on constantly. Other than that I would think it's a sensor problem. Are you in an N16 or N15?
 
hi again. i drive n16 1.8 petrol. i put new sensor in few days ago. cleared the code that it generated. no more codes coming up. my model does not have air-con. can it be ecu?thanks for reply.
 
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