Description
Heating servo motor for CITROEN C2 C3 cars and other CITROEN PEUGEOT 1007 models
Part description
Electric heater servo motor (valve servo drive) from Valeo designed for selected Citroën and Peugeot cars. This part ensures the movement of the flaps in the heating/ventilation system, so it has a direct effect on the proper functioning of the air flow control.
If you’re dealing with malfunctioning or erratic heater controls, clicking/rattles from the dashboard when changing settings, or a flap that won’t “come in”, the servo motor is a common suspect – and that’s why it’s often searched for under product numbers F663746X.A / 6447NL.
Technical information
- Manufacturer: Valeo
- Model: Citroën C2, Citroën C3, Citroën C3 Pluriel, Peugeot 1007
- Other numbers: not specified
Product codes
- Product codes: F663746X.A, 6447NL
Installation recommendations
Generally/typically for heating servo motors, the exact approach and procedure varies according to the specific model and design (position of the servo, type of connector, attachment, need to dismantle parts of the interior).
1) Before assembly
- Compare the old and new part: same product number (F663746X.A / 6447NL), body shape, position and type of connector, fixings (packs/screws).
- Check the condition of the connector and pins (oxidation, bending), the surrounding wiring and any plastic damage.
- If the original servo was making noises or “jumping”, consider checking whether the controlled flap is mechanically sticking (the servo is then unnecessarily overloaded).
2) Necessary tools and materials
- Normal set of screwdrivers and bits (according to attachment in the car)
- Small ratchet/extension (according to space)
- Plastic pry bar for removing covers
- Flashlight
- Electrical contact cleaner (optional)
3) Step-by-step assembly procedure
- Turn off the ignition and disconnect the battery to be safe.
- Access the servo space (typically by removing the cover(s) in the interior depending on the specific car).
- Take a photo of the original condition (wiring routing, connector position) for easier reassembly.
- Disconnect the servo electrical connector – do not pull on the cables, release the connector lock.
- Loosen the servo attachment (screws or latches – depending on the design) and carefully remove the servo.
- Check the landing surface and the surrounding area: dust, loose parts, possibly mechanical jamming of the controlled part.
- Mount the servo in the same position as the original piece; make sure it fits correctly without violence.
- Secure fit (tighten/snap) and connect connector.
- Return the disassembled covers and interior parts back.
- Connect the battery.
- Turn on the ignition and test the response to changes in heating/ventilation settings (smooth, no unusual noises).
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4) Post-assembly checks and test drive/function verification
- Verify that the servo works consistently when changing settings repeatedly.
- Check for any unusual noises (clicking, skipping) that would indicate a misaligned or sticking valve.
- After a short ride, re-verify the function and check that all covers are firmly attached.
5) The most common assembly mistakes + how to avoid them
- Exchanging a similar servo (different connector/mounting): always compare the numbers and designs before assembly.
- Damage to the connector when disconnecting: release the fuse and do not pull on the cables.
- Incorrect seating (servo “forced”): if it does not go easily, check the position and landing.
- Ignoring flap stuttering: if the mechanics rub, the servo can quickly become damaged again.
Reasons why the part is damaged
- Wear of gears and internal mechanisms due to age and repeated cycling.
- Stick flaps in the heating/ventilation system – the servo is overloaded and damaged.
- Moisture and oxidation of contacts in the connector or inside the part.
- Voltage fluctuations and electrical spikes in the on-board network that can accelerate electronics failure.
- Inappropriate handling during disassembly/assembly (damage to plastics, connectors, cabling).
