Description
Heater servo motor for Citroën C2, C3 and Peugeot 206 and 307.
This heater servo motor (HVAC actuator) is intended as a direct-fit replacement for climate control units in Citroën C2, Citroën C3 (including C3 Pluriel) and Peugeot 206 and 307 models. Designed for mechanics and DIY enthusiasts, the unit restores precise flap movement and temperature routing in the ventilation system, eliminating incorrect airflow distribution, malfunctioning temperature control or repetitive clicking from the dashboard area. Common search keywords: heater servo motor, HVAC actuator, blend door actuator, Citroën servo motor, Peugeot servo motor, part numbers 95494, 6447QN.
Technical Information
- Manufacturer: Buhler BEHR
- Model: Citroën C2; Citroën C3; Citroën C3 Pluriel; Peugeot 206; Peugeot 307
- Product Codes: 95494, 6447QN
- Other Numbers: Often referenced for Citroën/Peugeot HVAC systems (see product codes above)
Function And Typical Symptoms
The servo motor controls the position of ventilation flaps inside the heater/air conditioning unit to route air to defrost, face or foot outlets and to mix hot and cold air for temperature control. When the actuator fails, symptoms include repetitive clicking or knocking from behind the dash, inability to change airflow direction, incorrect cabin temperature, or no movement of the flaps when changing settings.
Common Failure Causes
- Plastic gear wear or stripped teeth (age and repeated movement).
- Motor burnout or worn internal motor brushes after long service life.
- Potentiometer/sensor failure inside the actuator, causing incorrect position feedback.
- Ingress of moisture or dust that seizes gears or corrodes contacts.
Installation Recommendations
- Work With The Battery Isolated Where Practical To Avoid Short Circuits When Handling Connectors.
- Access The Actuator Through The Glovebox Or Lower Dash Panel According To The Vehicle Model — Take Care Not To Break Plastic Clips.
- Before Removing The Old Unit, Cycle The Climate Controls To Note The Flap Position And Replicate During Installation.
- Disconnect The Electrical Connector, Remove Mounting Screws, Replace Unit And Ensure The Actuator Is Properly Seated On The Flap Shaft—Do Not Force The Gears.
- After Fitment, Verify Full Range Of Movement By Operating HVAC Controls And Listen For Smooth Operation; If Required, perform a calibration sequence as per the vehicle’s service manual.
- Use Basic Hand Tools (screwdrivers, Torx/Phillips as required) and keep fasteners and clips organized for reassembly.
Replacement Procedure (General Guidance)
- Remove the glovebox or lower dash trim to reach the HVAC housing.
- Locate the faulty servo actuator on the heater box; mark flap orientation if needed.
- Unplug the electrical connector and remove mounting screws holding the actuator.
- Fit the new servo motor in the same orientation, secure screws, and reconnect the connector.
- Test functionality across all vent modes and temperatures; check for absence of noise and correct flap travel.
Why The Part Usually Fails
Failures are typically caused by long-term wear of internal plastic gears, motor wear from frequent cycling, or contamination (moisture/dust) that leads to seizure or electrical faults. These actuators are subject to repeated small movements every time the HVAC settings change, so age and environmental exposure are the main contributors to failure.
Search By Part Number: Many technicians and DIYers find this servo motor by using the product codes 95494 or 6447QN. Confirm compatibility by matching these codes against the vehicle’s spare parts list or the parts you are replacing.
