Mercedes-Benz CLS550 air conditioning and heater malfunctioning since 2018 despite 2,000 repair on Mercedes-Benz CLS550

Some Mercedes-Benz CLS550 owners report experiencing ongoing issues with the air conditioning and heater systems, even after costly repairs. These issues often stem from complex diagnostic processes that involve electrical, mechanical, and coolant-related components. Additionally, some owners have noted concerns with the blower motor, which can fail and lead to decreased air pressure, accompanied by unusual noises, weak airflow, or even burning odors in rare cases. Air flow problems from the vents when the heater is activated might indicate fan or blower motor malfunctions, potentially due to a blown fuse, bad relay, or faulty components. Furthermore, some owners report that a faulty thermostat can cause the heater to blow cold air, affecting overall performance. Given the persistent nature of these problems, it is advisable for owners to revisit their repair shop or seek a second opinion to effectively address the underlying issues.