Complete wiring harness for the air conditioning and climate control system, designed for Citroën C4 B7 (C4 II) vehicles. This harness (OEM reference T1008911F, additional number 6436N7) routes power and signal lines between the HVAC control module, blower motor, actuators, sensors and A/C compressor circuit. Built to restore full climate control functionality, it is suitable for professional workshops and experienced DIY mechanics who need a direct-fit replacement part.

Description

This complete A/C wiring harness connects all electrical components of the heating, ventilation and air conditioning system. It ensures reliable communication and power supply to the blower motor, temperature and position actuators, pressure and temperature sensors, condenser/compressor control and cabin connectors. Replacing a damaged harness eliminates intermittent faults, loss of A/C control, blower outages or malfunctioning flaps caused by broken wires, corroded pins or connector failures.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 B7 (C4 II)
• Product Codes: T1008911F
• Additional Numbers: 6436N7

Compatibility And Applications

Intended for Citroën C4 B7 vehicles (commonly referenced as C4 II). Often searched by OEM code or secondary reference — T1008911F and 6436N7. Fits vehicles that use the same HVAC electrical architecture; verify vehicle model and part numbers before installation.

Replacement Procedure

High-level replacement steps for experienced technicians:

• Disconnect the negative battery terminal before any work on the electrical system.
• Remove required dash trim and access panels to reach the HVAC unit and connectors. Keep track of fasteners and clips.
• Unplug all harness connectors from actuators, sensors, blower motor and compressor wiring. Note connector positions for correct reassembly.
• Release harness clips and routing ties, remove the old harness and install the new harness following the original routing to avoid chafing.
• Reconnect all plugs securely, reattach mounting clips, reconnect the battery and perform a full functional test of blower speeds, flap actuators and A/C compressor control.

If access to the evaporator or sealed refrigerant components is required, have refrigerant handling performed by a certified workshop — do not vent refrigerant to atmosphere.

Installation Recommendations

• Always Disconnect The Battery Before Starting Work To Prevent Short Circuits Or Airbag Faults.
• Follow Manufacturer Service Procedures For Dashboard/Duct Removal To Avoid Damage.
• Inspect Connectors And Pins For Corrosion; Clean Or Replace Damaged Plugs To Ensure Reliable Contact.
• Secure The Harness With Correct Clips And Avoid Sharp Edges Or Heat Sources When Routing.
• After Installation, Perform Full HVAC Diagnostic Checks: Actuators, Blower, Sensor Readings And Compressor Engagement.

Why This Part Fails

Common causes of harness failure include mechanical wear and chafing where the loom contacts structural edges, connector corrosion due to moisture ingress, damaged or bent terminals, rodent chewing, and heat-related degradation of insulation. Intermittent faults typically manifest as loss of blower speeds, stuck temperature/flap actuators or failure of the A/C compressor signal. Early diagnosis and replacement of a compromised harness prevents further electrical damage and restores system reliability.

Replace your worn or damaged A/C wiring harness with this OEM-referenced assembly (T1008911F / 6436N7) to bring climate control back to full operation. Ideal for professional mechanics and competent DIYers who value direct-fit, part-number-specific replacements.