I am actually trying to be helpful for once! A full how to dismantle and fit a new heater matrix, but you'll have to put it back together yourself. This is a TU 1.1 engine with no air con. This should help you to remove the matrix without completely dismantling your 205 dashboard. Having not tried this on a non TU car I don't know how different it is so good luck!
![](https://i.ytimg.com/vi/d7lDnn4n6p4/maxresdefault.jpg)