Description
Heating servo motor for Citroën C5, C6 and Peugeot 407, 607
This HVAC servo motor (heater actuator) is designed for Citroën and Peugeot vehicles and is commonly referenced under codes such as 6447RJ, EAD 552 or 4puh-19e616-ac. It controls the position of ventilation and heating flaps inside the heater box to ensure correct air distribution and temperature mixing. A direct replacement for worn or noisy actuators, it restores precise climate control, eliminates abnormal flap noise and prevents incorrect temperature distribution that frustrates drivers and workshops alike.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 (second generation), Citroën C6, Peugeot 407, Peugeot 607
- Product Codes: 4puh-19e616-ac, EAD 552, 6447RJ
- Other Numbers: 6447RJ (alternative reference often used by workshops)
Fitment And Application
Suitable for climate control systems in Citroën C5 II, Citroën C6, Peugeot 407 and Peugeot 607. Frequently searched by part numbers (6447RJ, EAD 552, 4puh-19e616-ac), so check the code against your defective unit to confirm compatibility before installation.
Common Symptoms And Failure Modes
- Intermittent or constant grinding, clicking or buzzing from the dashboard area.
- Vent flaps stuck in one position, incorrect air distribution or inability to change temperature properly.
- Electrical failure of the small DC motor, seized or stripped plastic gears, connector corrosion or water ingress from heater box leaks.
- Failures often develop gradually—noise or sluggish flap movement is usually an early sign.
Installation Recommendations
General replacement steps used by professional technicians and experienced DIYers:
- Disconnect the negative battery terminal before starting to avoid electrical shorts and to prevent unintended airbag deployment while working near the dash.
- Gain access to the actuator—depending on the model this typically requires removal of the glovebox or lower dashboard trim to reach the heater box from the passenger side.
- Unplug the electrical connector, remove the retaining screws, and extract the old actuator. Inspect the flap mechanism for debris or broken teeth that could damage a new actuator.
- Install the new servo motor in the correct orientation, secure with screws, reconnect the electrical connector and reassemble the trim panels.
- After fitting, verify full range of motion by cycling the climate control through different modes and temperatures. Some vehicles may self-calibrate the actuator on first run; others may require a simple manual alignment procedure—consult workshop manuals for model-specific steps.
Why This Part Fails Most Often
Actuators operate continuously over many years and are subject to thermal cycling, dust infiltration and moisture. The most common causes of failure are worn or stripped plastic gears, motor burnout from heavy use, and corrosion of electrical connectors. Water ingress from heater core leaks or clogged drainage can accelerate deterioration. Regular inspection during HVAC repairs can reveal early wear and prevent secondary damage to ducting or adjacent components.
Order using the part codes 4puh-19e616-ac, EAD 552 or 6447RJ to find the correct replacement quickly. Replacing a faulty servo motor typically restores normal climate function and eliminates related dashboard noises.
