Description
Overview
This BEHR heater servo motor (Heater Servo Motor H1959 U b 44) is an HVAC actuator used on PSA vehicles, commonly fitted to Citroën C4 and Peugeot 307 II models. It controls the HVAC blend/air distribution doors to regulate cabin temperature and airflow. Technicians and DIY enthusiasts frequently search by product code (EAD512, 6447RZ, 6447RF) when replacing this component.
Features and Benefits
- Direct replacement for OE-style heater servo motors designed for PSA HVAC systems.
- Precise control of blend and distribution flaps to improve cabin comfort and temperature accuracy.
- Compact electric motor with integrated gearing for straightforward fitment in the dash assembly.
- Useful for workshops and home mechanics who identify parts by product numbers (EAD512, 6447RZ, 6447RF).
Fitment and Compatibility
Typical fitment: Citroën C4 and Peugeot 307 II equipped with PSA HVAC systems that use the EAD512 series servomotor. Always verify compatibility using your vehicle VIN or cross-check the product codes stamped on the original unit before ordering.
Installation and Replacement
Replacement overview (general procedure): remove the glovebox or under-dash trim to access the HVAC housing, disconnect the electrical connector, unclip or unscrew the servo from the HVAC box, and fit the new unit ensuring correct gear engagement and connector seating. Recalibrate the HVAC servo if required by the vehicle (some models perform self-calibration on first power-up). Installation should be carried out by a trained technician or an experienced DIYer with basic tools and safety precautions.
Causes Of Failure And Expected Service Life
Common failure modes include worn plastic gear teeth, seized or burnt motor windings, internal potentiometer faults, and moisture ingress. Operating life varies with use and environment; many servos show issues after several years of service, particularly in vehicles exposed to humidity or heavy duty cycling. Symptoms of failure include stuck flaps, incorrect temperature distribution, or audible clicking from the dash.
Practical Tips
- Confirm the part number on the old servo before ordering to avoid fitment issues.
- Check connector pins and wiring for corrosion when replacing the unit.
- If the HVAC system requires coding or calibration after replacement, follow manufacturer procedures or use appropriate diagnostic tools.
Technical Information
- Manufacturer: BEHR
- Model: Heater Servo Motor H1959 U b 44
- Product Codes: EAD512, 6447RZ, 6447RF
- Additional Numbers: H1959 U b 44
