Description
Heating and manual air conditioning control for Citroën C1 and Peugeot 107 vehicles up to 2014. With control cables.
This manual HVAC control unit with control cables is a direct-fit replacement for Citroën C1 and Peugeot 107 models produced until 2014. Suitable for professional workshops and experienced DIY mechanics, this unit restores control over temperature, fan speed and airflow distribution. The part is often searched by OEM reference numbers 55900-0H040, 6452P6 and related codes 6451SG, 6451SJ, 6451SH.
Function and Application
The unit operates the heating and manual air conditioning system by mechanically actuating the heater flaps and selecting fan speed and temperature. It typically controls:
- Temperature selection (mixing hot/cold air)
- Fan speed steps
- Air distribution (windscreen, face, footwell)
- A/C on/off and recirculation (depending on vehicle specification)
- Mechanical cable linkages to blend/door actuators
Replacement Procedure
Replacement requires basic dashboard trim removal and access to the center console. Typical steps:
- Remove surrounding trim panels using plastic trim tools to avoid damage to clips.
- Unscrew fasteners securing the control unit and carefully pull the unit forward.
- Disconnect electrical connectors and release the control cables from their anchors.
- Transfer cable ends or replace with the supplied cables; route cables free of kinks and secure retainers.
- Install the new unit, reconnect connectors, test all functions (fan speeds, temperature control, A/C and flap movement) before reassembling trim.
Installation Recommendations
- Disconnect the negative battery terminal before starting work to prevent short circuits and accidental airbag deployment.
- Use non-marring plastic trim tools to avoid breaking clips or scratching panels.
- Inspect and, if necessary, replace or lubricate cable ends and linkage points to ensure smooth operation.
- Check electrical connectors for corrosion or bent pins and clean contacts if required.
- Test the unit fully (all fan speeds, temperature ranges and flap positions) before reassembling the dashboard.
Most Common Failure Reasons
- Worn or stretched control cables causing imprecise or no flap movement.
- Broken plastic levers, sliders or knobs from age, sun exposure or mechanical stress.
- Worn potentiometers or internal contacts leading to intermittent fan speed or temperature control.
- Dirt, dust or moisture ingress causing sticking or electrical faults.
- Mechanical jamming of blend doors or flaps due to debris or seized actuators.
Service Life
Service life depends on usage and environment; components commonly begin to show wear after several years. Frequent use, exposure to heat and sunlight, or rough handling of knobs and cables accelerates wear. Many units remain serviceable for 8–15 years in normal conditions.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C1, Peugeot 107
- Product Codes: 55900-0H040, 6452P6
- Additional Numbers: 6451SG, 6451SJ, 6451SH
Useful Tips
- When fitting a replacement, compare part numbers and connector shapes to ensure correct fitment.
- If cables are frayed or binding, replace them rather than forcing movement—this prevents premature wear of the new unit.
- After installation verify proper airflow direction and full travel of all flaps at each control setting.
