
It is the outdoor temperature of the car. The following is the relevant introduction of the car thermometer: 1. Introduction: The main function of the car thermometer is to accurately measure and display the temperature inside the car, which can detect the car in real time and effectively avoid damage to the vehicle below the freezing point. 2. Expansion: With the continuous development of technology, the current car thermometer is no longer just a single measurement function. Some brands of car thermometers can measure both the internal and external temperature of the car at the same time, and are equipped with warning lights and icons to remind users to check whether the battery voltage is normal, keep the battery within the normal range, and protect the car in many aspects.

I've also noticed this temperature display while driving. It mainly comes from the sensor behind the dashboard, and sometimes there are probes near the center console. This position simulates the air temperature at chest height for the driver, but the error is quite noticeable. In summer, after being exposed to the sun, the area under the center screen feels hot to the touch, but the display might only show a little over 30 degrees. There's also a contrast in winter—last time I drove, my breath was visibly fogging, but the dashboard still showed 15 degrees. In actual use, it's best to adjust the air conditioning based on how you feel, not just relying on the numbers.

Most car temperature sensors are hidden behind the dashboard near the air vents, measuring the temperature of passing airflow. Locations vary slightly by model: Japanese cars often place it near the center console clock, while German brands prefer positions below the steering wheel. This reading doesn't reflect the cabin's average temperature - rear seats can be several degrees different. Once when driving kids to school, the rear passengers were freezing under blankets while front vents showed 25°C. For optimal AC use, try cold air through front defrost vents while directing warm air to rear passengers.

This is actually sensor data from the vent area, with sensors about the size of a fingernail. Interestingly, luxury cars feature multi-zone monitoring, such as probes above the front seats and in the rear footwells. However, ordinary cars often only have single-point detection. Applying dark tint film to the windshield or a dirty cabin air filter can significantly affect accuracy. It's most noticeable in winter when the windshield frosts over—the glass may actually be below freezing, yet the dashboard still displays 10 degrees.

Most vehicles have a small hole or grid under the steering wheel, which is the air intake temperature sensor. Recently, I noticed a detail: when starting the car, it displays the residual temperature from when the engine was last turned off. Once, after the car was parked under the sun for three hours in summer, opening the door greeted me with a wave of heat, yet the dashboard still showed the pre-shutdown temperature of 26 degrees. Additionally, the external thermometer is usually hidden inside the rearview mirror bracket or behind the front bumper, and it operates as a separate system from the in-car display.


