B0434

Auxiliary HVAC Door Actuator Range/Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Incorrect distribution of air flows (for example, air flows only to the feet when windshield blowing is selected)
Noise (buzzing, clicking) from the climate control panel area
Lack of response to switching blowing modes

Causes

Mechanical jamming of the damper
Drive gear wear
Open or short circuit in wiring harness
Drive motor malfunction
Problems with the HVAC control unit

How to Fix

Diagnose the operation of the climate system using a scanner
Check the condition of the damper and actuator visually (removing the casing elements if necessary)
Test the drive motor and wiring harness integrity
Clean the damper mechanism from possible contamination
If necessary, replace the actuator or damper
Calibrate the system after repair

Related codes

B0435 B0436 B0437