What are the reasons for the unsatisfactory cooling performance of the Buick Excelle's air conditioning?

[Frances]

Specific reasons are introduced as follows: 1. Insufficient coolant: Under normal circumstances, if the air conditioning is not cooling, you can check whether the coolant is insufficient. If it is, add more. 2. Lack of refrigerant in the air conditioning system: This is the most common issue. A lack of refrigerant is key. When starting the system, first touch the return pipe to judge by temperature. If it is cold, check if the internal fan speed might be low. Clean or replace the internal pipe fins and dust filter. 3. The internal pipe is not cold, and the thick pipe may be flattened: If the internal pipe is not cold, the thick pipe may be flattened. Check the return air temperature; if it's not cold, then check the intake air. If the intake air is cold and frost forms, add refrigerant. If the frost gradually dissipates, it is certain that there is a lack of refrigerant. Compressor aging is not uncommon, and insufficient exhaust is the main issue. The high-pressure fins must be inspected, as dirt can also slow down cooling.