Description
Heating servo motor for Citroën C5, C6 and Peugeot 407, 607
This HVAC servo motor is used to drive the heater/air distribution flaps in Citroën and Peugeot passenger cabins. It is a direct-fit electrical actuator commonly replaced by mechanics and experienced DIYers when climate control does not respond correctly or airflow is misdirected. The part is frequently searched by product code, so listing the reference numbers below helps technicians and parts buyers find the correct unit fast.
Application And Function
The actuator controls flap position inside the heating and ventilation box, regulating air distribution between footwell, dashboard vents and windshield demist. Proper function is essential for cabin comfort and clear visibility. Faulty servos cause incorrect vent selection, stuck flaps or noisy operation when the HVAC system is adjusted.
How To Replace
Replacement is typically straightforward for a trained technician: Disconnect the battery to avoid short circuits. Gain access to the HVAC box—depending on model this can require removal of lower dash panels, glovebox or center console trim. Unplug the electrical connector, remove the mounting screws and extract the old servo. Fit the new unit ensuring the plastic gear spline meshes correctly with the flap mechanism, secure mounting screws and reconnect the electrical connector. Reassemble trim and reconnect the battery. Cycle the ignition and operate the climate controls through all positions to verify smooth movement and correct flap response. When available, follow the vehicle workshop manual for model-specific access and calibration procedures.
How Failures Typically Occur
Common failure modes include worn or broken plastic gears, motor wear or seized gearbox from age and contamination, electrical connector corrosion and intermittent potentiometer/position-sensor faults. Symptoms include grinding or clicking noises, vents stuck in one position, incorrect air distribution or no movement at all. Heat cycles, dust ingress and repeated mechanical stress are the usual causes that shorten actuator life.
Installation Recommendations
- Disconnect the negative battery terminal before starting electrical work.
- Record flap positions or mark gear alignment if present to ensure correct reassembly.
- Handle plastic gears and splines carefully to avoid damage during fitment.
- Check and clean the connector and harness for corrosion before reconnecting.
- After installation, verify full range of motion by running the climate controls through all modes; consult the workshop manual for any required calibration steps.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5, Citroën C6, Peugeot 407, Peugeot 607
- Product Codes: 4puh-19e616-ac, 6447RJ, EAD 552
- Additional Numbers: 4puh 19e616 ac (alternative formatting of code)
Notes For Buyers
Search by the product codes listed above to match the part to your vehicle. This servo motor is aimed at professional garages and skilled DIYers comfortable with dashboard disassembly and electrical connections. If your vehicle exhibits any of the symptoms described, replacing the HVAC servo motor is a common and cost-effective repair to restore proper climate control operation.
