Description
Behr Heater Servo Motor for Citroën and Peugeot Vehicles
High-quality BEHR heater servo motor designed for a range of Citroën and Peugeot models. This replacement actuator (EAD511 / B8036 / 6447VA) controls the HVAC flaps that regulate cabin temperature and air distribution. Ideal for professional workshops and experienced DIY mechanics who need a reliable, direct-fit part to restore proper climate control function. Typical symptoms prompting replacement include non-moving flaps, inconsistent cabin temperature, audible clicking from the dash, or loss of air mixing control.
Technical Information
- Manufacturer: Behr
- Model: Citroën C4; Peugeot 307; Citroën Xsara; Citroën C5 I
- Product Codes: EAD511, B8036, 6447VA
- Other Numbers: 6447VA
Function
The servo motor drives the HVAC blend or distribution flaps inside the heater box, positioning them according to commands from the climate control unit. Proper operation ensures accurate temperature mixing and directed airflow to vents, windshield or footwell. The unit works as a geared electric actuator with position feedback to the climate electronics.
Common Symptoms
- Clicking or grinding noises from behind the dashboard
- No change in air temperature despite control inputs
- Airflow stuck to one vent position (e.g., only defrost or only footwell)
- Intermittent operation or complete failure of flap movement
Replacement Procedure
Typical replacement steps for experienced mechanics or competent DIYers:
- Disconnect the vehicle battery before starting work.
- Gain access to the heater box by removing the relevant trim, glovebox or lower dash panels as required for the specific model.
- Locate the faulty servo motor on the heater box, unplug the electrical connector and remove the fixing screws.
- Inspect the mating flange and flap mechanism for broken plastic gears or debris before fitting the new motor.
- Fit the new servo in the correct orientation, secure fasteners, reconnect the wiring and reassemble trim panels.
- Reconnect the battery and verify full range of motion and correct temperature control operation.
Installation Recommendation
Follow manufacturer removal/installation sequence for the specific vehicle to avoid damage to trim and HVAC components. Do not force plastic gears; if movement is stiff, inspect for obstruction or damaged linkages. After installation, cycle the climate controls through full range to confirm smooth operation. Use proper hand tools and take care with electrical connectors. For models with automatic climate systems, allow the control unit to initialize the actuator by following the vehicle procedure.
Why This Part Most Often Fails
Failures are usually caused by mechanical wear of small plastic gears, contamination from dust or debris inside the heater box, moisture ingress, or electrical overload from intermittent short circuits. Heat cycling and repeated use over many years can accelerate gear degradation, leading to slipping or broken teeth and loss of accurate flap positioning.
When ordering, refer to the product codes (EAD511, B8036, 6447VA) to improve chances of correct fitment. Suitable for professional repair shops and competent DIY mechanics familiar with dashboard disassembly and HVAC systems.
