Description
Overview
The BEHR Heater Actuator H1959 U b 21 (EAD512 / 6447RZ) is a direct-fit HVAC blend door servo for PSA vehicles. Designed to control temperature mixing and airflow routing inside the heater box, this actuator ensures accurate cabin temperature regulation and reliable vent selection.
Fitment and Compatibility
Compatible with a range of PSA models, notably Citroën C4 and Peugeot 307 II. The unit is commonly identified by OEM or aftermarket codes (EAD512, 6447RZ, 6447RF). Always confirm compatibility by checking the part number on the original actuator or the vehicle VIN before purchase.
Function and Common Faults
The actuator drives the HVAC blend door (servo) or flaps to mix hot and cold air and to select vent positions. Typical failure symptoms include clicking or grinding noises from the dash, inability to change cabin temperature, stuck vents, or intermittent operation. Failures are usually caused by worn or stripped plastic gears, motor or internal potentiometer faults, moisture ingress, or long-term wear.
Replacement Guide
Replacement is straightforward for experienced technicians or competent DIYers: disconnect the battery, remove the necessary trim or glovebox to access the heater box, unplug the electrical connector, remove mounting screws, swap the actuator and reassemble. Always follow the vehicle manufacturer’s service manual for access steps, recommended torque values and airbag/connector precautions.
Durability and Service Advice
Actuators can last many years but are more likely to fail with high mileage, age or exposure to moisture and debris. Replacing a failing actuator promptly restores proper HVAC operation and prevents further discomfort or potential damage to HVAC components.
Technical Information
- Manufacturer: BEHR
- Model: Heater Actuator H1959 U b 21
- Product Codes: EAD512, 6447RZ, 6447RF
- Additional Numbers: H1959
Notes
Search by part number (EAD512, 6447RZ, 6447RF, H1959) for fastest results. If uncertain, compare the connector type and mounting pattern with the existing unit or consult a repair manual for exact removal instructions.
