changed the radiator and found that the wires from the temp sensor on the rad had broke is there any way how to if the issue?

could this be the cause why my fans don't kick in when warm?

Yes. That would be why the fans weren't working.

could this be the cause why my fans don't kick in when warm?

 

You need to solder in some new wire or get a plug with some wire on and join it up. Depends where it's broken.

I couldn't really see but looks like they've come out the plug

http://www.partsbase.org/skoda/fabia-fab-eu-2005-12173-cooler-for-coolant-fan-ring-bracket-for-radiator-fan/

 

Might help if you need part numbers