Description
BEHR Heater Servo Motor for Citroën and Peugeot vehicles
Product Overview
This used BEHR heater servo motor (heater actuator) restores precise control of temperature blend and air distribution in many Citroën and Peugeot HVAC systems. Identified by codes such as EAD511, B8036 and 6447VA, the unit is a direct-fit electric actuator that moves flaps inside the heater box to regulate cabin airflow and temperature. Ideal for professional workshops and DIY technicians who search by part number, this actuator brings back reliable climate control when the original unit fails.
Technical Information
- Manufacturer: BEHR
- Model: EAD511
- Product Codes: EAD511, B8036, 6447VA
- Additional Numbers: 6447VA
- Compatible Models: Citroën C4; Citroën Xsara; Citroën C5 I; Peugeot 307; Peugeot 406; Peugeot 607
- Application: Heater/Climate Control Servo Motor (Air Blend/Flap Actuator)
Fitment Notes
This servo motor is commonly referenced by its product codes and is often searched using those numbers. Compatibility is primarily with Stellantis-era Citroën and Peugeot models listed above, but always verify that the part numbers on the replacement match the numbers from the old unit and the vehicle’s HVAC assembly. Visual comparison of the connector and mounting points is recommended when replacing used parts.
How The Part Works
The actuator contains a small DC motor and a gear train that translates rotation into movement of the heater box flaps (blend doors or distribution flaps). By positioning these flaps the HVAC system controls the proportion of hot and cold air and selects vents (footwell, dashboard, windshield) to achieve the selected temperature and airflow routing.
Replacement Procedure
- Prepare: Park vehicle on a level surface, set parking brake and remove ignition key.
- Safety: Disconnect the negative battery terminal before starting work to avoid short circuits and unintended actuator movement.
- Access: Remove required interior trims (glovebox, lower dash panels or center console depending on model) to reach the heater box and actuator mounting location.
- Disconnect: Unplug the electrical connector from the actuator and remove any retaining screws or clips.
- Replace: Remove the faulty unit and install the replacement in the same orientation. Secure fasteners and reconnect the electrical plug.
- Verify: Reconnect the battery, power up ignition and cycle the HVAC controls through all modes to confirm correct movement. Some systems may perform a self-calibration on first power-up; otherwise move the controls through full travel to check full range.
Installation Recommendations
- Always Disconnect The Battery Before Work.
- Handle the actuator gears and plastic mounting points carefully; avoid forcing the unit into position.
- Inspect the heater box for debris, broken gear teeth and water ingress; clean and dry the area before installation.
- Check electrical connector pins for corrosion and ensure a secure connection; use contact cleaner if necessary.
- If actuator movement is noisy or intermittent after installation, recheck linkage alignment and wiring. In some cases an HVAC system reset or cycling of the controls is required.
- Use OEM-equivalent fasteners and torque values where specified by manufacturer documentation.
Common Failure Causes
- Plastic gear wear or breakage – the most frequent cause, especially on older vehicles where gears become brittle with age.
- Water ingress or condensation inside the heater box causing corrosion or jamming of moving parts.
- Connector corrosion or intermittent wiring due to vibration and moisture exposure.
- Motor burnout from prolonged stall conditions (motor trying to turn jammed flaps) or electrical faults.
- Foreign objects or debris in the heater box preventing full flap travel.
Why Replace This Part
Replacing a failed heater servo motor restores accurate temperature control, eliminates incorrect airflow selection and reduces noise from sticking flaps. For workshops and skilled DIYers, sourcing a BEHR unit with matching codes (EAD511 / B8036 / 6447VA) gives a direct-fit option that simplifies installation and reduces diagnostic time.
Search Tips
Customers frequently search using the part codes EAD511, B8036 or 6447VA. Use these identifiers when looking for compatible units to improve the chance of exact fitment.
