What's this for?

[gumby6371]

I noticed at the weekend there is a small grill in the plastic by my interior light but not sure why.
If I had aircon I'd expect a temp sensor behind it but as I don't should there still be a sensor?

I must say the blower never gets cold even on the lowest setting so if there is a sensor I could change/clean that would be great.

Any thoughts?

I'll get some pics up if it helps, car spec in my sig.

[Welly]

It is a grille, behind which is a 'sample fan' and a temp sensor for the climate control.

It's a tiny propeller and draws a bit of the cabin's air across a sensor. They can seize up with fluff but apparently can recover after a good clean and spring back into life

[gumby6371]

Thanks Welly I assumed my poor old non-aircon LX wouldn't have such things and just ran from the twisty temperature pot, I'll have a look and a play when it's light and dry.