Description
Heater servo motor for Citroën C8 and Peugeot 807 and other Citroën and Peugeot models.
High-quality Magneti Marelli heater servo motor EAM590 (6447LW) designed for reliable operation in Citroën and Peugeot HVAC systems. Intended primarily for professional garages and experienced DIY mechanics, this actuator restores precise flap control for heating and ventilation, eliminating incorrect airflow distribution, unusual noises, or failure to change temperature settings. The part is ideal when the original actuator shows play, broken plastic gears or electrical faults. Common search terms: Magneti Marelli EAM590, 6447LW, Citroën C8 heater motor, Peugeot 807 HVAC actuator, blend door actuator.
Technical Information
- Manufacturer: Magneti Marelli
- Model: Citroën C8; Peugeot 807 (also used on other Citroën and Peugeot models equipped with the same actuator)
- Product Codes: EAM590; 6447LW
- Other Numbers: 6447LW (alternative formatting: 6447.LW)
Function
This servo motor drives HVAC flaps inside the heater box to control air distribution and blend of hot/cold air. It converts electrical commands from the climate control unit into precise mechanical movement of the flaps, ensuring correct cabin temperature and airflow direction. A faulty servo can cause stuck vents, incorrect temperature, or clicking noises from the dashboard.
Compatibility And Fitment
Direct replacement for vehicles fitted with Magneti Marelli EAM590 / 6447LW heater actuators, most notably Citroën C8 and Peugeot 807. Compatibility is typically determined by matching the product code on the old actuator. Fitment can vary by production year and equipment level; when the existing actuator bears code 6447LW or EAM590, this unit is the intended replacement.
Installation Recommendations
- Prepare the vehicle: park on level ground and remove ignition key.
- Access: The actuator is usually located on the HVAC unit behind the glovebox or lower dashboard. Remove trim panels or the glovebox to reach the heater box.
- Disconnect electrical connector and remove retaining screws. Note the orientation of the actuator and any splined shaft position before removal.
- Install the new actuator in the same position, secure screws and reconnect the electrical plug. Ensure flaps move freely and are correctly engaged with the mechanism.
- Verify operation: cycle the climate control through all modes and temperatures to confirm correct movement and absence of abnormal noises.
- Recommended Tools: Torx/Phillips drivers, trim tools, basic multimeter for quick electrical checks.
Common Failure Causes
- Worn or broken plastic gears inside the actuator causing play or loss of movement.
- Motor burnout or worn brushes resulting in intermittent or no operation.
- Water ingress or contamination from leaks leading to corrosion and mechanical seizure.
- Mechanical binding of HVAC flaps caused by foreign objects or debris.
- Age and frequent operation accelerate wear; failures often appear as clicking noises, inability to change vent positions, or incorrect cabin temperature control.
This Magneti Marelli EAM590 (6447LW) heater servo motor is a practical, service-focused replacement that helps restore HVAC function quickly and reliably when the original actuator fails. Suitable for professional installation; competent DIYers with basic tools can also perform the swap following the steps above.
