Description
Heater Servo Motor for Citroën C4 and Peugeot 307 II
Description
This replacement heater servo motor (HVAC actuator) is designed for Citroën C4 and Peugeot 307 II climate systems. Supplied with common manufacturer and aftermarket references (Behr / EAD512 / 6447RF / 6447RZ / H1959), the unit drives the internal flaps that control airflow direction and temperature mixing inside the dashboard. The part is often searched by its product codes, so listing OE and reference numbers helps mechanics and DIY enthusiasts find the correct item quickly.
Application And Function
The servo motor operates the blend/mode flaps in the heater and ventilation box, enabling correct distribution of warm or cold air to the cabin (footwell, face vents, windshield) and mixing of hot/cold air to achieve set temperatures. Proper operation is essential for climate comfort and windshield demisting. Typical fitment vehicles: Citroën C4 and Peugeot 307 II (verify part number compatibility with your vehicle’s listed codes).
Symptoms Of Failure
- Clicking or knocking noises from the dashboard when changing HVAC settings.
- No airflow from selected vents or inability to change vent mode.
- Incorrect cabin temperature due to failed blend control.
- Intermittent operation or complete loss of actuator movement.
Recommended Installation
Installation is straightforward for a trained mechanic but typically requires partial dashboard access. Typical procedure:
- Disconnect the battery before starting to avoid short circuits and protect vehicle electronics.
- Access the actuator by removing glovebox or lower dash panels as required for your model.
- Unplug the electrical connector and remove the mounting screws holding the old servo motor.
- Fit the new unit in the same orientation, secure with screws, and reconnect the connector.
- Reinstall trim panels and reconnect the battery. Cycle the HVAC controls through full range to allow the mechanism to settle; if required, perform an actuator calibration or adaptation using diagnostic equipment.
For workshop technicians: if the HVAC system does not return to correct operation after mechanical replacement, perform an adaptation procedure with a compatible diagnostic tool. Follow manufacturer removal/installation sequences to avoid damaging plastic gears or cables.
Why The Part Most Often Fails
- Plastic Gear Wear Or Breakage: Internal plastic gears can wear or snap over time, causing loss of movement or noisy operation.
- Motor Burnout Or Electrical Faults: Motor windings or electronics may fail due to age or voltage spikes.
- Contamination And Moisture: Dust, debris, or moisture ingress can seize gearing or corrode connectors.
- Mechanical Strain: Stiff or obstructed flap mechanisms increase load on the servo and accelerate wear.
Technical Information
- Manufacturer: Behr
- Model: Citroën C4; Peugeot 307 II
- Product Codes: 6447RF; 6447RZ; H1959; EAD512
- Additional Numbers: H1959 U b 21; EAD512 6447RF
Notes For Buyers
This servo motor is commonly searched by its reference numbers—listing these codes in your search will increase the chance of finding the correct unit. Suitable for technicians and skilled DIYers comfortable with dashboard disassembly. Always follow safety procedures and vehicle-specific instructions during replacement.
