1966 Fiat 600 D heats up and radiator help

[Z33]

hi all, i acquired a 1966 Fiat 600 and over the past few weeks I've realised that it has a serious cooling problem..its worrying as I now live in an extremely warm country with summer in the high 30s!


The radiator just doesn't seem to do its job..could it be that I need to strip it and check the piping? or is it a common problem?

Google search reveals that Abarth produced radiators for racing but weren't so suitable for road cars. Is there any other radiator swap which doesn't require any major modification to keep the car as original as possible?

any help will be much appreciated!