What does 'outside' mean in car air conditioning?

[PaigeDella]

In a car, 'outside' refers to the external temperature, indicating that the outdoor temperature is lower than the interior temperature of the car. It serves as a reminder for the driver to turn on the heater to prevent the windows from fogging up. Below are detailed explanations: 1. Function: When a car displays 'outside,' it is usually followed by a number indicating the current external temperature. If the outdoor temperature is below 4 degrees, it alerts you that the external environment is quite cold, possibly leading to icy roads. This serves as a warning for drivers to be cautious while driving, avoid sudden braking, and prevent potential hazards. 2. External Temperature Sensor: Also known as the ambient temperature sensor, it is typically installed near the front bumper or grille. Its sensing element uses a negative temperature coefficient thermistor. The detection method for the external temperature sensor is the same as that for the coolant temperature sensor, and its resistance can be measured using a multimeter in resistance mode. The lower the temperature, the higher the resistance.