
Automotive refrigerant, commonly known as 'snow compound' in Chinese, is also referred to as portable refrigerant. Currently, most passenger vehicles (primarily civilian cars) use two types of refrigerants: R-12 and R-134a. Methods for adding refrigerant to a car: 1. High-pressure side charging - Suitable for post-leak detection and vacuum evacuation procedures. Note: The compressor must remain off during this method, with the engine stopped, and the refrigerant tank must be inverted. 2. Low-pressure side charging - This method involves adding gas refrigerant, characterized by slower charging speed, typically used for refrigerant replenishment scenarios.


