I generally leave my temp dial at 21 degrees with the fan speed at 0. Think I'm right in saying that it maintains this temperature for you.
I only use the blower if I'm clearing the screen or if it mists up inside. I have never pressed the a/c button, not had the need to, so if the car maintains the temp you set regardless of blower speed or even if the a/c button is switched on, then whats the point of the a/c button.
The owners manual is not very clear, the Climatronic system however is explained in detail.
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