Mini Cooper 06 fan problems

[Carlylouise]

Hi just recently got my car back from having a new theormstat housing replaced and all new pipes as there was as a leak, just got it back yesterday and my fan now comes on as soon as I start the car (engine cold) and stays on whilst driving it, it then only goes off when I turn the car off after about 5/10 mins, it's never done it before. Any ideas what it could be? And if it's going to cost a fortune as I've just had to pay out a lot already
HELP
Thanks

[Carlylouise]

Thank you for the reply . Would you recommend I go to mini dealership or just a standard garage?

Thanks

[Carlylouise]

It doesn't have AC it's an 06 Mini Cooper but on the boarder line of 07 and haven't got that luxury