Vauxhall/Opel Astra J radiator fan not working... or is working? Fault finding and repair.

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Hi
This car came to me after had an engine replacement due to a bad head gasket...
The complaint was that the radiator fan was not kicking in when the coolant reached the 90°C...
But, what was actually wrong, was something completely different...
Follow me on this video to find out what was the problem and how to resolve it.
Hope you enjoy the video.
Any questions or comments put them below.
Like always, thank you for watching!