Mercedes-Benz S400 HVAC not cooling in high temperatures with compressor motor error codes P06A64 and P06A016 on Mercedes-Benz S400

Some Mercedes-Benz S400 owners report experiencing HVAC cooling issues, particularly in high temperatures, accompanied by compressor motor error codes P06A64 and P06A016. These owners have identified several potential causes, including refrigerant leaks that prevent proper cooling, as well as electrical climate control issues that can stop the AC compressor from functioning. Additionally, a malfunctioning compressor, clogged cabin air filters, and dirty condenser or evaporator coils have been noted as factors that hinder cooling efficiency. Some have also reported problems with a faulty blower motor, as well as issues related to bad fuses or relays affecting the AC system. To address these concerns, owners are advised to inspect refrigerant levels, assess compressor functionality, and ensure all system components are clean and functioning correctly, while following recommended maintenance practices.