Part description

This used heater and air conditioning controller is designed for Citroën C3 II A51 and DS3 cars. Also included are control cables, which is important when replacing a damaged or non-functional original part.

The part is used for normal control of the heating and air conditioning system in the interior of the car. When looking for the right piece, the match according to the product number is most important, so we recommend comparing the markings directly on your original controller.

A suitable solution for auto mechanics and home repairs if you need to replace a worn, mechanically damaged or non-functional heating and air conditioning control panel.

Technical information

• Manufacturer: Stellantis Citroën Peugeot
• Model: Citroën C3 II A51, DS3
• Other numbers: 400018005, 6452R3

Product codes

• Product codes: 9675400280, 400018005, 6452R3
• Models from labels/backgrounds: Citroën C3 II, DS3

Installation recommendations

For this part, the exact replacement procedure may vary depending on the specific design of the car. Below is a general and typical procedure for replacing a heater and air conditioning controller with wires.

1) Before assembly

• Check whether the product number and the overall design of the part match the original piece.
• Compare connectors, attachment points, faceplate shape and cable routing.
• Check that the cables are not kinked, pinched or mechanically damaged.
• For the used part, check the smooth operation of the controls without excessive resistance.

2) Necessary tools and materials

• Set of common hand tools
• Plastic pry bar for panel removal
• Screwdrivers or bits according to the type of connecting material
• Flashlight
• Contact cleaner and cloth

3) Step-by-step assembly procedure

1. Turn off the ignition and secure the vehicle against movement.
2. It is generally recommended to disconnect the battery, especially if you will be handling electrical connectors in the interior.
3. Remove the covers and trim that prevent access to the heating and air conditioning control panel.
4. Carefully release the original controller from its mount so as not to damage the surrounding plastics.
5. Disconnect the electrical connectors and then gently unhook or release the control cables.
6. Compare the old and new part side by side, especially the length and fit of cables, connectors and position of controls.
7. Before fitting a new part, check the cleanliness of the connectors and the condition of the mounting in the dashboard.
8. First connect the cables so that they are not crossed, stretched or bent unnaturally.
9. Then connect the electrical connectors and verify that they are properly seated.
10. Place the controller in the mounting position and fix it in the original way.
11. Before fully assembling the paneling, test the smooth operation of all control elements.
12. If everything is working properly, refit all the covers and finish assembling the interior parts.
• 4) Post-assembly checks and function verification
  • Check that the controls work smoothly and without stuttering.
  • Verify the correct response of the heating and air conditioning settings in individual positions.
  • Check that the panel is firmly held and there is no play or unwanted underarms.
  • After a short run, check again if the cable has moved or loosened.

  5) The most common assembly mistakes + how to avoid them

  • Part replacement by appearance instead of number – always compare all available designations.
  • Damage to plastic parts during disassembly – use suitable plastic tools and proceed without excessive force.
  • Bad routing of cables – make sure they are routed naturally without sharp bends and tension.
  • Insufficiently inserted connectors – always check for proper seating after connection.
  • Assembly without continuous testing – always test the control function before final assembly of the interior.

  Reasons why the part is damaged

  • Normal mechanical wear from long-term use of controllers.
  • Damage to cables, their snagging or increased resistance during operation.
  • Crack or fatigue of the plastic parts of the panel and handles.
  • Reckless handling during previous disassembly or repair of the interior.
  • Contamination of the mechanism, which causes worse operation of the control elements.
  • Wear of electrical contacts on a frequently used part.
  ]]>