MKL

Hello maybe anyone can share some advice, I just recently a week back bought a legacy 2011 110kw 2.0 petrol. I was driving the car and suddenly the engine overheat light came on & the car engine switch off behind a red light, I got out opened the hood and noticed that on the right side bottom front where the radiator is and the big hose goes to it was leaking.. Is it a expensive repair? I do have warranty for 3 months on the car but thinking of selling it now if it is a serious problem.