Description
Overview
The Valeo heater servo motor is a direct-fit HVAC actuator designed for PSA vehicles, including Citroën C2 and C3 models. It replaces part numbers F663746L/B and 6447NL to restore accurate control of heater and ventilation flaps.
Function And Application
This 12V servo controls the position of blend and air-distribution flaps inside the HVAC box, regulating cabin temperature and airflow direction. When operating correctly it provides precise flap movement and consistent climate control response, eliminating intermittent heating or incorrect vent selection.
Compatibility
Commonly fitted on Citroën C2 and C3 and compatible with other Citroën and Peugeot models that use the same part numbers. Always verify the vehicle’s part number or electronic fitment before purchase to ensure correct application.
Common Failure Modes
- Wear or stripping of internal plastic gears causing slipping or grinding noises
- Stuck or intermittent flap movement due to motor wear, debris or contaminated lubricant
- Corroded electrical connector or damaged wiring leading to loss of power
- Ingress of moisture causing electrical failure or intermittent operation
Installation Notes
Replacement is typically performed from the passenger-side dash area by removing the glovebox or the lower fascia to access the HVAC unit. Typical steps: disconnect the battery; remove trim or glovebox for access; unplug the actuator connector; remove mounting screws or clips; fit the replacement servo; reconnect and test the HVAC operation. Some vehicles may require a simple calibration or cycling of the climate controls after installation.
Who Should Buy
Designed for professional mechanics and experienced DIY enthusiasts who are comfortable with dashboard removal and HVAC components. Purchase this servo when you encounter clicking noises, unresponsive flaps, or inconsistent cabin heating.
Technical Information
- Manufacturer: Valeo
- Model: Citroën C2, Citroën C3 (Selected Citroën & Peugeot Models)
- Product Codes: F663746L/B, 6447NL
- Additional Numbers: Check Vehicle/Parts Catalog For Equivalent References
