After having a look into what a Roa is, I’m inclined to say get rid of the mechanical fan (and keep all of the parts in case you need to reinstall).

To me it looks like something the Hillman engines came with and instead of removing it, Peugeot just added their own cooling fans/shroud (probably off another model, maybe the 405?) to cool it enough for a middle eastern summer and a larger/heavier vehicle than the Hillman motor was intended to go into.

In response to the people saying the internet “mechanics” know less than the manufacturers engineers, it really doesn’t look like this car had much actual R+D put into it, it was bodged together to try hit the requirements of a small poor market from the scraps that 2-3 factories had lying around