As my first post, it's never nice to start with a problem. But I had the same issue on my 2007 model. Took it in to the mechanic yesterday and they ran a diagnostics, and found... nothing. They then also quoted me between 4-6 hours labour to find the issue, and potentially replace the fan and switch.
I took the car home and decided to go through all the fuses, relays and looms to see if anything was causing the problem.
BIG THANKS to turkey172 for the diagrams, they literally saved me.
After going through the diagram references, 262, 321, 597, 1337, 1033 and cleaning the battery terminals, I was at a loss. I read through the whole post again, and noticed I hadn't checked the 234. It made sense, because the radiator fan wasn't kicking in, and my aircon wasn't blowing that cold. Turns out, it wasn't seated properly, and now all my problems are gone!
Just on a side note, I owned a 2007 1.6 dynamique before the 197, and had a similar issue. That time around it was the 321 connection to the switch which had started to crumble.