Well done with the tests, but it does not reflect my experience.
I did my own test today on a 2 hour motorway journey from Warrington to Barrow, mostly Motorway or fast A roads.
The
CC was set to Full Auto (i.e. everything on Auto, temp 22 degrees), I set this using the voice command "Climate Control Full Automatic".
I had a digital thermometer in the car with me on the passenger seat.
Here are the results :-
1. Starting temp in the car was 9C, all vents open
2. Started the run to Barrow, fan speed was low initially but increased to high as engine temp increased.
3. Temp of air was warm after 2 miles, cabin temp was now 11C
3. After 10 mins on the Motorway, fan speed started to decrease and cabin temp was 19C
4. A further 10 mins later fan speed was down to low and cabin temp reached 22C.
5. After 1 hour 15 mins, the cabin temp started to drop, indicated by 21C on thermometer, and it continued to fall to 18C over the next 10 mins.
6. The
CC was still set to 22C, but cabin temp was now 18C with very chilly air being output, fan speed had not increased (as far as I was aware)
7. A further 10 mins and the temp had reduced to 17C and I gave in and increased the
CC to 23C, which only upped the cabin temp to 18C.
8. On reaching Barrow the cabin temp was only 18C even though the
CC was set to 23C with everything else on Auto.
This has been my experience on all of my long journeys (although not measured with thermometer) and it is not acceptable for a
CC system.
While I can see that others have not had this problem, many other do see this and would like it to be resolved.
Ian