Mercedes-Benz GLC300 air conditioner causing loud fan and engine noise after recent service on Mercedes-Benz GLC300

Some Mercedes-Benz GLC300 owners report experiencing loud fan and engine noise following a recent service, which may be attributed to several factors. These owners note that the engine fan might be working harder due to excess heat generated by the air conditioning system, even when the fan is off. Additionally, issues such as low or overcharged refrigerant, compressor malfunctions, and dirty condenser or evaporator coils can lead to the AC blowing hot air, further contributing to the noise. Some owners have found that dealerships may struggle to identify the problem if it cannot be replicated during inspection. Furthermore, improper installation or malfunction of components like the AC compressor and expansion valve can adversely affect performance and lead to noise disturbances. A dirty pollen filter can also reduce airflow and strain the AC system, causing additional noise. In hot weather, the AC system may exert extra pressure on the engine, resulting in louder operation. Lastly, problems with engine components, such as a faulty positive crankcase ventilation (PCV) valve, can contribute to increased engine noise. It is advisable for owners experiencing these issues to have their AC system thoroughly inspected to identify and resolve the underlying causes.