Description
Denso heater servo motor designed for PSA group vehicles: compatible with Citroïn C4 Picasso, Citroïn Berlingo and Peugeot Partner second generation. This heater servo (actuator) controls the blend/air distribution mechanism in the HVAC unit and restores precise temperature regulation and airflow direction in the passenger compartment.
Technical Information
- Manufacturer: Denso
- Model: A 21200680 21200600 EFB350 6447XA
- Product Codes: 6447XA
- Other Numbers: EFB350
Function: The servo actuator positions the internal blend door or air flaps in the HVAC box to mix hot and cold air and direct airflow to vents, footwell or windshield. When functioning correctly it enables precise temperature control requested from the climate control unit or manual heater controls.
Common Failure Modes: These servos commonly fail due to worn or stripped plastic gears, small DC motor wear, water or moisture ingress, or electrical connector/signal faults. Symptoms include inability to change cabin temperature, incorrect airflow distribution, intermittent operation or clicking/whirring noises from the dashboard area.
Compatibility & Models: Intended for PSA vehicles such as Citroïn C4 Picasso, Citroïn Berlingo and Peugeot Partner (second generation). Always verify part numbers (A 21200680, 21200600, EFB350, 6447XA) against your vehicle VIN or current component before ordering to ensure fitment.
Replacement Notes: Access typically requires removal of the glovebox or lower dashboard trim to reach the HVAC box depending on model. Prior to replacement, disconnect the battery, note flap positions and electrical connectors, remove retaining screws and unplug the actuator. Installation is straightforward for experienced technicians; expected labour time varies by model but is generally moderate. If unsure, have a professional workshop perform the swap.
Condition & Serviceability: This is a used part that has been inspected and prepared for resale. It is supplied ready for installation and is a cost-effective way to restore HVAC function. While used components can offer excellent service life, replacement intervals depend on vehicle age, mileage and operating conditions — many failures appear after several years of use or following exposure to moisture.
Whether you are a professional mechanic or a competent DIY enthusiast, this Denso heater servo is a practical replacement option to regain reliable heating and climate control performance in compatible Citroïn and Peugeot models.
