How to Check Automotive Refrigerant?

[StMichael]

Methods for checking automotive refrigerant: 1. Locate and clean the sight glass, then start the engine and activate the air conditioning system. If the refrigerant level in the AC system is appropriate, you should observe clear refrigerant flowing continuously through the sight glass without any bubbles; 2. Perform a temperature check - if both pipes of the dryer feel similar in temperature, it indicates the refrigerant charge is proper. Insufficient refrigerant in the automotive AC system will lead to inadequate cooling performance. For factory-installed AC systems, refrigerant typically needs replenishment every three years assuming no leaks exist. AC system pipes and joints naturally lose about 50% of refrigerant annually, so reduced cooling efficiency doesn't necessarily indicate refrigerant deficiency. When noticing insufficient cooling, owners should first inspect the system for potential leaks.