Discovery Sport cabin temp sensor fan location?

Hi, I'm hoping someone can give me some advice, I have a Discovery Sport HSE with an air con / heating issue. The cabin warms up to the set temperature, then after about 20 mins decides to blow cold. Turning the temperature up then blows warm for a while then blows cold again. I suspect a temp sensor somewhere is faulty or blocked. Diagnostics show an intermittent B105A-71 cabin temp sensor fan fault. Does anyone know where this is located please.
Thanks in advance.
Ell.

It's behind the inboard trim adjacent to the steering column trim & switch cluster (the one with a small round grille), there's one screw and four metal spring clips holding the trim on which you need to pull away to gain access.