HVAC Air Mix Door Performance
The HVAC control module has detected that the air mix (blend) door does not reach the commanded position within the expected time. The blend door regulates the ratio of air through the heater core versus around it.
Affected components
- Air mix door actuator
- Hvac control module
- Blend door linkage
Common causes
- High likelihood: Blend door actuator motor failed
- Medium likelihood: Blend door mechanically binding or broken
Possible symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.