No radiator in car?

Hello, and sorry, this is a bit of a weird one

My VW polo failed it's MOT based on a few minors and a major which was an overheating issue.

I've owned the car for four years so I've had it through four MOTs. I've used a new garage and they are telling me there's no radiator on the car. In any realms of possibility is it possible I've been driving a car with no radiator long distances for four years and had no issues? Also would the other garage not have notice there wasn't one?

Looking for anyone's input, I'm kind of lost here. I can't argue back with them as a I don't know what I'm talking about.

Thanks