Description
Product Overview
This BEHR Heater Servo (H1959 U B 14) is an HVAC blend/actuator unit manufactured for PSA vehicles, commonly fitted to Citroën C4 and Peugeot 307 II models. Supplied under reference EAD512 and associated codes 6447RZ / 6447RF, this servo motor controls airflow mix or door position inside the heater box to regulate cabin temperature. It is a standard spare part for technicians and competent DIYers looking to restore precise climate control response.
Key Features & Benefits
- Direct-fit replacement for Citroën C4 and Peugeot 307 II HVAC systems (check part codes before ordering).
- Precise actuator movement to restore correct blend-door or flap positioning for temperature and vent selection.
- Compact design from a recognised thermal-management supplier (BEHR) for reliable installation in the heater box area.
- Often located and searched by product codes (EAD512, 6447RZ, H1959) — use these codes for fast cross-referencing.
Fitment & Compatibility
Intended fitment is typically on PSA platforms fitted to Citroën C4 and Peugeot 307 II. Always verify compatibility by matching the vehicle VIN, existing part code, or physical comparison. This servo matches original references such as EAD512 and related codes 6447RZ / 6447RF and H1959 U B 14 found on OEM and aftermarket listings.
Function And Common Symptoms
The heater servo (actuator) moves internal flaps or blend doors to direct airflow and mix hot/cold air according to HVAC commands. When faulty, symptoms include:
- Incorrect cabin temperature or inability to change temperature smoothly.
- Noisy operation from the dash area (grinding or clicking).
- Vent selection or airflow direction stuck on one position.
- Intermittent or no response from the HVAC controls to temperature adjustments.
Why Heater Servos Fail
Typical failure modes include worn internal plastic gears, potentiometer or position-sensor degradation, electrical connector faults, or water/moisture ingress into the heater box. Normal wear over many years and repeated movement can eventually cause loss of accurate positioning or noisy operation.
Replacement Guide (Overview)
Replacing an HVAC servo on these models is a moderate DIY task for experienced home mechanics or a routine job for workshops. Typical steps:
- Disconnect the negative battery terminal to avoid electrical faults.
- Access the servo — it is usually mounted on the heater/ventilation box behind the glovebox or lower dash. Remove the glovebox or trim panels as required.
- Unplug the electrical connector and remove the retaining screws or clips holding the actuator in place.
- Install the replacement unit, secure fasteners, reconnect the wiring and reassemble interior panels.
- Reconnect the battery and cycle the HVAC controls to confirm correct movement and operation across all modes.
If you are unsure about access or calibration procedures, consult a workshop manual or a professional technician. Some vehicles may require a basic calibration or control-head relearn after replacement.
When To Replace
There is no fixed interval; lifespan varies with usage and environmental conditions. Replace the servo when symptoms appear (erratic temperature control, noise, or stuck vents). Prompt replacement restores comfort and prevents further stress on HVAC components.
Search Tips For Mechanics & DIYers
This part is frequently located by part number. When searching or ordering, use any of the known references: EAD512, 6447RZ, 6447RF, H1959 U B 14. Also cross-check vehicle model (Citroën C4, Peugeot 307 II) and VIN when possible to ensure correct match.
Technical Information
- Manufacturer: BEHR
- Model: Citroën C4; Peugeot 307 II
- Product Codes: EAD512, H1959 U B 14
- Other Numbers: 6447RZ, 6447RF
If you need assistance confirming fitment for a specific vehicle or VIN, provide the VIN or the existing part code and a technician can help verify compatibility. Ordering by the correct product code speeds up sourcing and reduces the risk of returns.
