Description
Heating servo motor for CITROËN C4 and PEUGEOT 307 II
BEHR air conditioning actuator
The BEHR heating servo motor (heater actuator) is a direct replacement part for the climate control system on Citroën C4 and Peugeot 307 II models. Designed to control flaps and blend doors inside the HVAC box, this actuator restores precise temperature distribution and airflow direction when the original unit becomes noisy, intermittent or stops moving. Ideal for professional workshops and DIY mechanics, the unit fits OEM-style mounts and electrical connectors used on many Stellantis vehicles, making it a reliable option to solve common cabin comfort issues quickly.
Technical Information
- Manufacturer: BEHR
- Model: Citroën C4, Peugeot 307 II
- Product Codes: EAD512
- Additional Numbers: 6447RF, 6447RZ, H1959, U b 42
Function And Application
The servo motor operates the HVAC blend door or distribution flaps inside the heater box, translating electrical commands from the climate control unit into precise mechanical movement. Proper function is essential for correct cabin temperature regulation, defogging and directing airflow to vents, feet or windshield.
Symptoms Of A Faulty Unit
- Clicking or grinding noises from the dash area when changing temperature or vent settings.
- No change in cabin temperature despite adjusting controls (stuck at hot or cold).
- Airflow directed incorrectly or not switching between vents/defrost modes.
- Intermittent operation or complete electrical failure of the actuator.
Replacement Procedure (Overview)
Typical replacement is straightforward for a trained technician or a competent DIY mechanic. Procedures vary slightly by vehicle, but common steps include:
- Disconnect The Battery Before Starting Work To Avoid Short Circuits Or Unintended Airbag/Body Control Issues.
- Access The HVAC Box—Often Through The Glovebox Or Lower Dash Panel—Removing Trim Fasteners As Needed.
- Locate The Servo Motor On The Heater Box, Carefully Unplug The Electrical Connector And Remove The Fixing Screws.
- Fit The Replacement Unit, Reattach Screws And Connector, Reassemble Trim, And Reconnect The Battery.
- Check Operation By Cycling The Climate Controls Through Modes And Temperatures To Ensure Flaps Move Smoothly.
Installation Recommendations
- Always Disconnect The Battery Before Starting Work.
- Inspect Surrounding HVAC Components For Broken Plastic Gears, Debris Or Signs Of Moisture That Could Cause Repeat Failures.
- When Reinstalling, Ensure The Actuator Is Correctly Seated To The Flap Shaft And That Mounting Screws Are Secure But Not Over-Torqued.
- After Installation, Run A Full Function Test (All Modes And Temperatures) To Confirm Proper Calibration And Movement.
- If Intermittent Electrical Faults Persist, Check Wiring And Connector Contacts For Corrosion Or Damaged Pins.
Why This Part Most Often Fails
Heater actuators commonly fail due to worn plastic gears, internal motor wear, or contamination by dust and moisture in the HVAC box. Repeated thermal cycling and frequent flap movement over many years accelerates gear degradation. Symptoms typically begin with clicking noises and progress to complete loss of flap movement. In some cases, electrical faults such as damaged connector pins or intermittent motor windings cause failure.
Why Choose This Unit
Choosing a direct-fit BEHR actuator provides a cost-effective repair that restores climate control functionality and driving comfort. The part is suited for professional garages and skilled DIYers who want a reliable OEM-style replacement for Citroën C4 and Peugeot 307 II HVAC problems.
