Hoping this may be helpful to someone in the future.
My 62 reg Corsa D Black Edition 1.4T started to be noisy, to be specific it sounded like a noisy fan.
I managed to recreate the noise by switching on the AC. I took the car to a Vauxhall dealer and they said there were no fault codes and...
I don’t think my radiator fan is working as it doesn’t seem to come on when the car is up to temperature. There is a connector at the top of the radiator which has 3 pins should there be a voltage here when the car is up to temperature?