Description
Heater servo motor for Citroën C5 (2005–2007), C6, and Peugeot 407, 607. Climate control gear motor.
Product Overview
This replacement heater servo motor (servo actuator) is designed for Citroën and Peugeot ventilation systems and addresses common HVAC faults such as clicking noises, stuck airflow flaps, and incorrect cabin temperature distribution. Popular search codes and part numbers for this unit include EAD 552, 4PUH-19E616-AB, 4PUH-19E616-AC and 6447RJ — customers and technicians frequently search by these codes to find the correct unit quickly. The unit is a direct-fit motor reducer for the climate control box and is suitable for professional garages and DIY mechanics who perform HVAC repairs on PSA platform vehicles.
Function And Symptoms
The servo motor operates the blend/air distribution flaps inside the heater/air conditioning housing. It contains a small electric motor and a reduction gearbox that translate motor rotation into precise flap movement. When the servo begins to fail, typical symptoms include audible clicking from the dashboard, inability to change airflow direction or temperature reliably, intermittent operation, or complete inoperability of the affected flap. These faults result in poor cabin comfort and uneven heating or cooling.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C5 (2005–2007), Citroën C6, Peugeot 407, Peugeot 607
- Product Codes: EAD 552, 4PUH-19E616-AB, 4PUH-19E616-AC, 6447RJ
- Other Numbers: EAD552, 4puh-19e616-ab, 4puh-19e616-ac, 6447RJ
- Application: HVAC heater/air-conditioning gear motor (servo actuator) for blend/air distribution flaps
Installation Recommendations
- Disconnect Battery Before Work: Always disconnect the vehicle battery before removing the HVAC unit to avoid short circuits and prevent damage to electronic components.
- Access: Access is typically gained by removing glovebox, lower dashboard trim or center console depending on model. Follow vehicle-specific removal steps to reach the climate control housing.
- Removal: Unplug the electrical connector, remove retaining screws, and carefully extract the old servo. Inspect the surrounding gear train and housing for debris or broken plastic pieces.
- Fitment: Install the new servo ensuring correct orientation and full engagement of gear teeth. Tighten screws to a moderate torque and reconnect the electrical connector securely.
- Initial Check: Reconnect battery, start the ignition and cycle the HVAC controls through all modes to verify smooth flap movement and to allow the system to perform any self-calibration routines.
- Service Tip: Inspect wiring and connector pins for corrosion or damage and repair as needed. If plastic gear fragments are present, clean thoroughly before installing the new unit.
Common Failure Causes
- Plastic Gear Wear or Breakage: Many servo failures are caused by worn or broken plastic gear teeth in the reduction gearbox.
- Moisture Ingress: Condensation or water ingress can corrode contacts or damage motor windings.
- Electrical Issues: Connector corrosion, wiring faults or intermittent supply can cause erratic operation.
- Mechanical Overload: Frozen flaps caused by debris or ice can overload the motor and strip gears.
- Aging: Prolonged use and temperature cycling accelerate wear of internal components.
Replacement Frequency And Notes
There is no fixed service interval for HVAC servos; failures are usually age- and use-related. Many units last for years, but plastic gears and small motors commonly fail after extended use or when exposed to contaminants. When replacing the servo, always confirm part numbers match the original unit and inspect the HVAC housing for secondary damage that could affect the new servo.
Why Choose This Unit
This servo motor is listed under commonly searched PSA part codes and is intended as a like-for-like replacement for the affected Citroën and Peugeot models. It restores precise flap control for comfortable cabin climate and eliminates typical noise and malfunction symptoms associated with worn or failed actuators.
Recommended For
Automotive technicians, independent garages and competent DIY mechanics performing HVAC repairs on Citroën C5 (2005–2007), C6, Peugeot 407 and 607 models who require a direct-fit replacement servo motor.
