One or more blend door vacuum actuators may fail resulting in the incorrect output temperature from the HVAC system. Failed actuators will require replacement to restore proper HVAC operation.
Car Problem Reports
Mercedes-Benz 300E Blend Doors in HVAC May Stop Working Due to Bad Vacuum Actuators
Mercedes-Benz 300E Problem
Average Mileage: 191,000 mi (180,000 mi - 202,000 mi)