AUTOMATIC AIR CONDITIONING SYSTEM : Temperature Control

WARNING: This page is about a different car, the 2011 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Temperature Control Circuit Diagram (Automatic Air Conditioning System)

Courtesy of NISSAN MOTOR CO., U.S.A.

When power switch is in the ON position, A/C auto amp. always automatically controls temperature regardless of air conditioner operational state.
A/C auto amp. Calculates the target air mix door opening angle according to set temperature, in-vehicle temperature, ambient temperature, and sunload.
Air mix door is controlled according to the comparison of current air mix door opening angle and target air mix door opening angle.
Regardless of in-vehicle temperature, ambient temperature, and sunload, air mix door is fixed at the fully cold position when set temperature is 18.0°C (60°F-61°F), and at the fully hot position when set temperature is 32.0°C (89°F-90°F).

Fig 2: Air Mix Door Opening Angle And A/C Auto Amp. Calculated Temperature Graph
Courtesy of NISSAN MOTOR CO., U.S.A.