Why is the Audi A6L's air conditioner blowing cold on one side and hot on the other?

[Branden]

Audi A6L's air conditioner blowing cold on one side and hot on the other may be caused by the following reasons: 1. Insufficient refrigerant: When the refrigerant is insufficient, the evaporation and heat absorption process of the liquid refrigerant entering the evaporator ends quickly, causing the evaporator to absorb heat and cool down only when the refrigerant flows in, while having no heat absorption effect when the refrigerant flows out. At this time, only a small portion of the airflow blown by the blower is cooled, resulting in temperature differences between the air outlets on both sides. Measuring the pressure in the high and low pressure lines of the air conditioning system can determine if there is insufficient refrigerant, and replenishing the refrigerant can solve the problem. 2. Low efficiency of the air conditioning compressor: The air conditioning compressor may have low efficiency due to malfunction, resulting in insufficient liquefaction of the refrigerant. When the refrigerant in this state enters the evaporator, the effect of evaporation and heat absorption will also be severely insufficient, leading to poor cooling performance, which ultimately manifests as the airflow temperature at the outlets failing to meet the standard. 3. Dirty condenser and evaporator: Long-term lack of cleaning can cause the condenser and evaporator to be covered with dust and debris, weakening the effect of the refrigerant or reducing the heat absorption efficiency when the refrigerant changes state, preventing the air from being fully cooled, and ultimately causing temperature differences in the airflow output from the various air outlets.