Description
Heating servo motor for Citroën C5 2005–2007, C6, Peugeot 407, 607. HVAC motor gearbox.
Product Overview
This heating servo motor (heater actuator) is designed for climate control systems in selected Citroën and Peugeot models. The unit combines a 12V electric motor with an integrated gearbox and position feedback to operate HVAC flaps and blend doors, ensuring correct distribution of air and temperature regulation inside the cabin. It is a direct-fit replacement for worn or failed actuators that produce noise, fail to move flaps, or cause incorrect airflow/temperature behavior.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 (2005–2007), Citroën C6, Peugeot 407, Peugeot 607
- Product Codes: 4puh-19e616-ac, 6447RJ, EAD 552
- Other Numbers: EAD552, 4PUH-19E616-AC
Function And Application
The actuator moves HVAC flaps and blend doors to control air direction, mixing of hot/cold air and temperature distribution. Proper function is essential for defrosting, comfort temperature control and targeted airflow to vents. The unit transmits position via an internal potentiometer or feedback sensor to the climate control module so the system can reach the requested settings.
Common Symptoms Of Failure
- Clicking or grinding noises from the dashboard area when changing climate settings.
- Flaps staying in one position or moving intermittently.
- Incorrect cabin temperature or inability to select temperature zones.
- Airflow directed only to one set of vents (e.g., defrost only) regardless of controls.
Why The Part Most Often Fails
Failures are typically caused by mechanical wear of the small plastic gears inside the gearbox, worn motor brushes, degraded potentiometer/position sensor, or contamination from moisture and dust. Prolonged exposure to humidity and temperature cycles accelerates gear and electronic wear. Incorrect door alignment or obstructed flap travel can also overload and damage the actuator.
Replacement And Installation
Access to the heater actuator usually requires removing the glovebox or lower dash panels to reach the heater box where the actuator is mounted. Typical replacement steps:
- Disconnect the negative battery terminal before starting work.
- Remove trim panels or glovebox to expose the heater box.
- Disconnect the electrical connector from the actuator.
- Remove mounting screws and detach the actuator from the flap shaft.
- Install the new actuator, ensure gears and flaps are aligned and move freely, then secure fasteners and reconnect the electrical connector.
- Reconnect the battery and verify full range of flap movement and proper climate control operation.
Installation Recommendations
- Always disconnect the battery before removal and follow manufacturer torque and service instructions to avoid damage to the unit or vehicle electronics.
- Inspect surrounding HVAC components and flap linkages for damage or obstructions before fitting the new actuator.
- Check for signs of water ingress or clogged drain channels that could have contributed to failure and correct as needed.
- After installation, cycle the climate system through all modes to confirm correct operation and to allow the control module to re-learn flap positions if necessary.
Notes For Mechanics And DIY Enthusiasts
This actuator is a common service item on the listed Citroën and Peugeot models. It is a practical repair for both professional workshops and competent DIYers comfortable with disassembling dash trim and basic electrical connectors. Keep replacement fasteners and clips handy, as some trim pieces are fragile on older vehicles.
Compatibility And Identification
Searches often use part numbers (4puh-19e616-ac, 6447RJ, EAD 552) to find the correct heater servo. Confirm that the physical shape, connector type and mounting points match the removed unit when replacing. The listed models are the primary fitment based on the supplied information.
