Description
Heater servo motor for CITROËN and PEUGEOT vehicles. You may receive a direct replacement. Climate control gear motor.
Product Overview
This Valeo heater servo motor (also referred to as a climate control gear motor or HVAC blend/air distribution actuator) is designed for use in Citroën and Peugeot HVAC systems. It operates the internal flaps that direct airflow and control temperature mixing inside the ventilation unit. Commonly searched under part numbers T1006419G, 0312131B or 6447NL, this servo is a direct-fit replacement for a range of Stellantis small car models and is aimed at professional mechanics and DIY enthusiasts servicing Peugeot 308 and Citroën C2, C3 and C4 II vehicles.
Function And Symptoms
The servo motor converts electrical signals from the climate control into mechanical motion to move blend doors or air distribution flaps. When it starts to fail, typical symptoms include grinding or clicking noises from the dash, inability to change airflow direction or temperature, stuck vents, or intermittent operation of the HVAC controls. Replacing the faulty servo restores precise flap movement and eliminates erratic climate behaviour.
How To Replace
- Safety First: Disconnect the vehicle battery before starting any work on the HVAC electrics.
- Access: Depending on the model, access is usually via the glovebox, lower dashboard trim or center console to reach the heater box. Remove the necessary panels and mounting screws to expose the actuator.
- Removal: Unplug the electrical connector, remove mounting screws and extract the old servo. Note the position of any splines or indexing tabs.
- Installation: Fit the new servo in the correct orientation, secure with screws and reconnect the electrical plug. Verify full range of motion by operating the climate controls before refitting interior trims.
- Final Check: Reconnect the battery, run the HVAC through all modes and temperatures, listen for smooth operation and confirm vents respond correctly.
Technical Information
- Manufacturer: Valeo
- Model: Heater Servo Motor / HVAC Actuator
- Product Codes: T1006419G, 0312131B
- Other Numbers: 6447NL
Installation Recommendations
Always work with the battery disconnected and follow the vehicle manufacturer’s removal and installation sequence to avoid damaging connectors or control circuits. Test the new unit’s movement before reassembling the dashboard. Use the correct sized tools and avoid forcing plastic gears—if the actuator does not move freely, double-check fitment and alignment. Where available, verify actuator operation through the vehicle diagnostic menu after installation.
Most Common Failure Causes
- Plastic Gear Wear Or Stripping: Repeated use and aging can wear or break internal plastic gears, the most frequent cause of failure.
- Motor Or Brush Wear: The small DC motor or its brushes can wear out, causing intermittent or no movement.
- Water Ingress Or Corrosion: Moisture reaching the actuator can corrode contacts or impede movement.
- Obstruction Or Misalignment: Debris in the heater box or incorrect seating can overload the servo and cause gear failure.
- Electrical Faults: Damaged wiring or connectors can prevent power or control signals from reaching the servo.
Service Life
Service life varies with usage and environment; many servos last several years, while high-use or harsh conditions (humidity, temperature cycling) shorten longevity. If you hear unusual noises or notice loss of control, replacing the actuator early prevents secondary damage to other HVAC components.
