Mercedes-Benz SL550 trunk closes automatically and windshield washer reservoir does not stay full on Mercedes-Benz SL550

Some Mercedes-Benz SL550 owners report experiencing issues with the trunk closing automatically, which may be linked to a faulty trunk lid actuator. If the trunk opens but then closes on its own, disconnecting the actuator and manually closing the trunk can help determine if replacement is necessary. Additionally, some owners find that problems with the hydraulic pump, which controls the trunk, can lead to similar automatic closure issues. Regular maintenance and inspection of components like the trunk latch sensor are also recommended to prevent operational problems. Furthermore, some owners report difficulties with the windshield washer reservoir not staying full, often due to leaks in the system. Signs of leaks may include fluid loss from the undercarriage pan, which can indicate issues with grommets under the windshield or headlight washer motors, as well as broken hoses or connectors. Addressing these potential causes promptly can help maintain the fluid level in the reservoir and ensure proper functionality.