Description
Heater servo motor for CITROËN C4 and PEUGEOT 307 II vehicles.
This BEHR heater servo motor (HVAC actuator) is designed to control the heating/ventilation flap movement in the climate box of Citroën C4 and Peugeot 307 II models. A direct-fit replacement for worn or noisy actuators, it restores precise control of airflow direction and blend temperature. The unit is suitable for professional workshops and experienced DIY mechanics who maintain Stellantis vehicles and often search by part number (e.g. 6447RF, 6447RZ, H1959).
Key Features
- Direct replacement for original HVAC flap actuators on Citroën C4 and Peugeot 307 II.
- Controls blend/mode/recirculation flaps depending on vehicle configuration.
- Improves climate control responsiveness and removes clicking or grinding noises from the dashboard area.
- Supplied with electrical connector compatible with the original harness (check product codes for exact fit).
Replacement Procedure
Typical replacement is straightforward for trained mechanics and competent DIYers with basic tools. General steps:
- Disconnect the negative battery terminal before starting work.
- Gain access to the actuator location (commonly behind the glovebox or lower dashboard panel depending on model).
- Remove necessary trim panels and the glovebox to expose the HVAC housing.
- Unplug the electrical connector and remove mounting screws securing the actuator to the heater box.
- Fit the new actuator in the correct orientation, secure with screws, reconnect the electrical connector and reassemble trim.
- Reconnect the battery and cycle the ignition/AC controls to confirm correct operation and allow any automatic flap calibration sequence.
Installation Recommendations
- Always disconnect the battery before disassembly to avoid short circuits and protect vehicle electronics.
- Keep the work area clean to prevent debris entering the HVAC housing; replace the cabin filter if contaminated.
- Handle the actuator gears gently; plastic gear teeth can be brittle after long service life.
- After installation, verify full range of movement for the controlled flaps and check for unusual noises or binding.
- If the actuator is part of a multi-motor HVAC system, ensure other actuators operate correctly to avoid incorrect feedback during calibration.
Common Failure Causes
- Plastic Gear Wear: Repeated movement and age cause teeth to wear or strip, producing clicking or grinding sounds and loss of position control.
- Motor Burnout: Internal DC motor or gearbox failure from prolonged use or electrical faults.
- Water Ingress and Corrosion: Leaks or high humidity can corrode connectors and internal components.
- Obstruction and Debris: Foreign objects or degraded insulation/cabin filter fragments can jam flaps and overload the actuator.
- Connector/Cable Issues: Poor electrical contact or broken wires lead to intermittent operation.
Typical Lifespan
Service life depends on usage, climate and maintenance. Actuators commonly begin to fail after several years of service—many vehicles experience issues in the 8–12 year range or after high mileages—though this varies by usage and environment.
How Failures Manifest
- Clicking or grinding noises from the dashboard area when changing temperature or air distribution.
- Inability to change temperature accurately or to direct airflow to selected vents.
- Stuck flaps or limited range of movement causing inconsistent heating/cooling performance.
- Possible HVAC fault codes or warning messages on some dashboards.
Technical Information
- Manufacturer: BEHR
- Model: Citroën C4; Peugeot 307 II
- Product Codes: 6447RF, 6447RZ, H1959, U b 14
- Additional Numbers: EAD512
Compatibility Notes
This actuator is commonly referenced by the part numbers shown above and fits HVAC systems used on Citroën C4 and Peugeot 307 II variants. Always confirm the part number match against the unit being replaced before installation.
