Product Overview

This is a direct-fit manual heater control unit designed for Citroën C1 and Peugeot 107 models produced up to 2014. The panel allows control of fan speed, temperature mixing and airflow direction for vehicles equipped with manual climate control. It is a commonly replaced component in older small city cars where knobs, potentiometers or mechanical linkages wear out over time.

Function

The unit controls the following functions on vehicles with manual HVAC systems: fan speed selection, temperature adjustment (blend), airflow distribution (face/feet/windshield) and, depending on variant, air recirculation. On many models the control panel transmits movement via cables (linkages) to internal heater/airbox flaps; some versions include the cable set as part of the assembly.

Replacement Procedure

• Disconnect the negative battery terminal before starting to avoid short circuits and protect vehicle electronics.
• Carefully remove surrounding trim panels in the center console to access the heater control unit. Use trim tools to avoid damaging plastic clips.
• Unscrew mounting fasteners and gently pull the unit forward to access electrical connectors and any cable linkages.
• Release electrical connectors and detach control cables if present (note their routing and orientation for reassembly).
• Install the new unit by reversing the removal steps: connect electrical plugs, reattach cables and secure the unit with original fasteners. Refit trim panels and reconnect the battery.

Installation Recommendations

• Always disconnect the battery before removal and follow the vehicle manufacturer’s assembly/disassembly sequence to avoid damage to connectors and control modules.
• If the unit is supplied with control linkages, ensure cables are routed and clipped in the same positions as the originals to prevent binding of the heater/ventilation flaps.
• Check related components during replacement: cable ends, cable guides, dash clips and the condition of the ventilation flaps/blend door actuators. A faulty actuator or blocked duct can mimic a control panel fault.
• Use basic hand tools and plastic trim tools; avoid prying directly on the faceplate to prevent cosmetic damage.

Why The Part Fails

Common failure modes include worn rotary potentiometers or switches, broken plastic knobs or mounting tabs, and frayed or detached control cables. Frequent use, exposure to heat cycles and mechanical stress on small plastic parts accelerate wear. Dust and debris from the HVAC ducts can also affect switch feel and electrical contacts over time.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C1, Peugeot 107 (up to 2014)
• Product Codes: 55900-0H040, 55900-0H020
• Additional Numbers: 6452P6, 6451SK

Compatibility Notes

This heater control is intended for vehicles listed above; compatibility is typically confirmed by the product codes stamped on the original part. When ordering, match the product code printed on your existing unit to ensure correct fitment and function. Units are commonly sought under the referenced product numbers.

Who Should Install

The replacement is suitable for experienced DIYers with basic dashboard trim experience and for professional technicians. If you are unsure about handling dashboard components or cable routing, consider professional installation to avoid damage to interior trim or HVAC components.

Direct-fit replacement heating control button (part code 6451SK) designed for the early Citroën C1 and Peugeot 107 models. Ideal for professional workshops and DIY mechanics who need a reliable spare part to restore heating and climate control functionality. The switch is commonly searched by the product code 6451SK, making it easy to find and order for vehicles of the first production series.

Features

• Direct fit for first-series Citroën C1 and Peugeot 107.
• Replacement for the original heating control switch used in early model center consoles.
• Straightforward installation — plug-in electrical connector and retaining clips/screws.
• Useful for restoring proper control response, indicator illumination and mechanical operation of the heating control panel.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C1 (first series); Peugeot 107 (first series)
• Product Codes: 6451SK
• Other Numbers: No additional cross-reference numbers provided

Fitment And Typical Symptoms

This button is intended for the first-generation Citroën C1 and Peugeot 107. Common symptoms indicating a faulty heating control button include unresponsive or intermittent operation, a button that sticks or does not engage, failure of internal illumination, or erratic behaviour of the heating/ventilation control related to that specific switch.

Replacement And Installation

1. Disconnect the vehicle battery before starting removal to avoid short circuits and prevent damage.
2. Remove the centre console trim using appropriate plastic trim tools to avoid breaking clips or scratching panels.
3. Unscrew or release the retaining clips holding the control module; carefully pull the module forward to access the connector.
4. Unplug the multi-pin electrical connector from the back of the button assembly and remove the old switch.
5. Install the new heating control button, reconnect the electrical connector and test the function and illumination before reassembling the trim.
6. Reassemble trim and reconnect the battery. Verify full functionality with the vehicle running if required.

Why The Part Commonly Fails

• Mechanical Wear: Repeated use over many years can wear the internal actuator and latching mechanism.
• Electrical Contact Degradation: Oxidation or pitting on contact surfaces can cause intermittent or failed operation.
• Environmental Damage: Moisture ingress, spilled liquids or corrosion can impair switch function and illumination.
• Plastic Fatigue: Age-related brittleness may cause housing clips or button elements to crack or break during use or removal.

Installation Recommendations

• Always disconnect the battery before removal and follow the vehicle manufacturer’s disassembly sequence to prevent damage to surrounding components.
• Use non-marring plastic trim tools to remove panels; avoid excessive force on clips and connectors.
• Inspect the wiring harness and connector for corrosion or damage; clean contacts if necessary before installing the new switch.
• After fitting, verify all functions (switch response, illumination and related HVAC behaviour) before completing reassembly.

If you are replacing a worn or failed button from a first-series Citroën C1 or Peugeot 107, reference the product code 6451SK when ordering to ensure correct fitment.