What are the reasons for the Mercedes-Benz 220's air conditioning not cooling?
1 Answers
Mercedes-Benz 220 air conditioning not cooling is due to reasons such as insufficient refrigerant, dirty condenser, or water in the pipeline. Below are detailed explanations of the specific causes. Insufficient refrigerant: Refrigerant loss is mainly due to leaks. If the car's air conditioning is not working well, and after refilling the refrigerant, the problem reappears after some time, attention is needed. A relatively simple method to detect leaks is to observe the condenser surface through the grille for signs of oil wetness. If such signs are present, it generally indicates a condenser leak. Dirty condenser: In summer, if the air conditioning cooling effect is poor, car repair shops often recommend cleaning the radiator. The main purpose of cleaning the radiator and condenser is to improve heat dissipation. When poplar or willow catkins accumulate on the condenser, it can lead to issues like high engine temperature or poor air conditioning performance. During cleaning, it's important to first use an air gun to blow away debris before washing with a water gun; otherwise, it may have the opposite effect, not only worsening air conditioning performance but also increasing fuel consumption. Water in the pipeline: The car's air conditioning refrigeration system includes a dryer tank, which absorbs moisture from the refrigerant. When the desiccant in the dryer tank becomes saturated, it can no longer filter out moisture. As the refrigerant passes through the expansion valve's throttle hole, its pressure and temperature drop, causing the moisture in the refrigerant to freeze in the small hole. This leads to restricted refrigerant flow, increased resistance, and ultimately, the air conditioning's inability to cool.
