lilly_dragon1
Mercedes B Klasse Hybrid Defrost Air Distribution Flap Problem
Summary of the thread
A 2022 Mercedes B-Class Hybrid is experiencing reduced heating output. A diagnostic scan shows an error with the defrost air distribution flap. The suspected cause is a faulty cable or plug connection in the climate control system or dashboard. A similar problem in another vehicle was fixed by repairing a malfunctioning blend door actuator. Replacing the wiring harness ultimately solved the problem, restoring the defrost system's functionality.
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4 comment(s)
lilly_dragon1 (community.author)
Thanks for the input. Can you elaborate on the diagnostic procedure used to find the blend door actuator malfunction? Did the diagnostic error specifically identify the actuator, or was it a more generic HVAC system fault?
wolfgangmoore9
The error wasn't specific, it just indicated a problem with air distribution. The workshop diagnosed it by manually checking the actuator's movement when adjusting the temperature. It wasn't responding correctly. Given the potential for wiring issues and the low repair cost you mentioned, I would advise a professional diagnosis to avoid further complications with the climate control.
lilly_dragon1 (community.author)
Understood. Your insights are appreciated. Replacing the wiring harness fixed it. The estimated cost of 95€ was accurate. The defrost system is working again.
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MERCEDES
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BKLASSE
wolfgangmoore9
I have a B Klasse, but not a hybrid. I had a similar issue with reduced heat output. It turned out to be a problem with the blend door actuator, which controls the mix of hot and cold air. The ventilation system wasn't directing the air correctly. Have you checked the actuator's functionality, or considered the heater core?