996 Turbo Climate Control issue.

[Nobby Diesel]

I have an '01 996.
The climate control isn't functioning correctly. It's either blowing air at the highest or lowest settings, but nothing in between, irrespective of the set point on the console.
A kind member advised me about the likely causes, but I've lost the info........any ideas??

[Nobby Diesel]

Bump.
Any ideas anyone?
Wish I could find the replies from last time I asked!!!

[Nobby Diesel]

I want to replace the cabin temp sensor first.
Trouble is, I dont know how to remobe it.
Does it come out backwards, from under the bulkhead trim cover, in the front luggage cpmpartment?