AC cycles though every vent mode on startup
05-03-2024, 02:54 PM
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2013 E350 Cabriolet (A207)
AC cycles though every vent mode on startup
Many times (but not every time) on startup, the AC cycles through all of its vent modes (dash, dash + floor, floor + defrost, defrost) before settling on the dash vents. It does this on auto mode, and when I set the desired vent mode manually. Otherwise, the AC works just fine. This condition is pretty annoying as it changes the air pressure in the car and can be pretty loud as the blower motor runs at full speed while this happens. Additionally, I'm concerned about the actuators for the blend doors wearing out. I'm not receiving error messages or blinking lights on the AC control panel. Could this be an issue with the control panel? Model year 2013.
05-03-2024, 06:24 PM
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MY'14 W212 M276 3.5NA @55kMi
Many times (but not every time) on startup, the AC cycles through all of its vent modes (dash, dash + floor, floor + defrost, defrost) before settling on the dash vents. It does this on auto mode, and when I set the desired vent mode manually. Otherwise, the AC works just fine. This condition is pretty annoying as it changes the air pressure in the car and can be pretty loud as the blower motor runs at full speed while this happens. Additionally, I'm concerned about the actuators for the blend doors wearing out. I'm not receiving error messages or blinking lights on the AC control panel. Could this be an issue with the control panel? Model year 2013.
I would use a good scanner to to read and directly test the AAC HVAC Module.
How old is the inside cabin air filter?
Last edited by CaliBenzDriver; 05-03-2024 at 06:28 PM.
