Diesel fan in Petrol engine?

Hi there,

I have a 2003, Berlingo Multispace and the radiator fan doesn't work. I bought a new one to have fitted but the mechanic who was working on it said that it actually has a fan for a diesel and not a petrol - which meant that the fan I bought didn't fit. I now have no idea which fan I need to get.

I have no idea about cars at all and was wondering if this is something that anyone has had experience with?

Thanks in advance

David