What is this button / Sensor ?

[jaydom]

Hello everybody,
What is this metal button hiding under the dash ?
I noticed it can turn, but nothing is explained in the owner's book...
Thanks for your help
Regards
Jay

[Tanguero]

It controls the set point for the thermostat on the air conditioning. It tends to be very sensitive and I wouldn't turn it unless you need to as it can very easily lead to the air con evaporator icing up which will stop your air con from working and result in water in the drivers sill cavity.

[jaydom]

Ok
Many thanks to you !
I won't touch it as the magic key !
Regards