Low Temperature Protection Control
WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Unified meter and A/C amp. will turn the compressor ON or OFF as determined by a signal detected by intake sensor.
When intake air temperature is higher than 4°C (39°F), the compressor turns ON. The compressor turns OFF when intake air temperature is lower than 2.5°C (37°F).