Why does the car air conditioner not cool when the vehicle is not running?

[DelPeter]

Damaged expansion valve, which prevents the formation of high pressure in the system before the expansion valve. The high-pressure refrigerant cannot reach the required pressure of 150Kpa, resulting in the evaporator after the expansion valve failing to cool down, leading to ineffective air conditioning. Here are the relevant details: 1. Definition: The automobile air conditioning device (air conditioning device), referred to as car air conditioning. It is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to the optimal state, providing a comfortable riding environment for passengers and reducing travel fatigue. It creates good working conditions for the driver and plays an important role in ensuring safe driving as a ventilation device. 2. Composition: Generally includes refrigeration devices, heating devices, and ventilation devices. This combined device makes full use of the limited space inside the car, with a simple structure and easy operation, making it a popular modern car air conditioning system internationally. With the rapid growth of the automobile industry, especially passenger cars, in recent years, the automotive parts industry has also developed rapidly.