Mercedes-Benz E55 AMG rear A/C blowing hot air instead of cool on Mercedes-Benz E55 AMG

Some Mercedes-Benz E55 AMG owners report experiencing issues with the rear A/C blowing hot air instead of cool. These problems may stem from low or overcharged refrigerant levels, which can disrupt the A/C's cooling efficiency. Additionally, a malfunctioning compressor is a common cause of this issue. Dirty condenser or evaporator coils can further exacerbate the problem by impacting the system's ability to cool effectively. Some owners also find that a faulty blend door actuator or defective evaporator temperature sensor can lead to hot air being blown. Other potential contributors include a bad AC pressure sensor or issues with fuses or relays. To resolve these concerns, it is advisable for owners to have a qualified technician inspect the refrigerant levels, check the compressor, and clean the condenser and evaporator coils, ensuring the A/C system operates efficiently.