My son bought a car on Sunday from a secondhand dealership. On the test drive, the air con was blowing but didn't seem very cold so he assumed maybe it hadn't had a chance to cool (he knows this shouldn't be the case now). He drove it home on the motorway (a long drive) and the air con didn't cool. He has since taken the car to be looked at and been told there's a leak. Should the dealership pay for this as it is not covered in the warranty that was provided?