Description
Complete BEHR digital air conditioning harness for Citroën C4 and Peugeot 307 from 2005
Premium replacement wiring harness designed for digital climate control systems on select Citroën and Peugeot models. This BEHR harness delivers full connectivity for the air conditioning system — including compressor clutch, pressure and temperature sensors, actuators and control-unit interfaces — ensuring reliable operation and accurate climate regulation. Ideal for professional workshops and experienced DIY mechanics searching by part number (e.g. 6445WZ / H4540), the harness is built to OEM-spec standards and helps restore factory functionality when the original cabling is damaged or corroded.
Technical Information
- Manufacturer: BEHR
- Model: Citroën C4; Peugeot 307 (from 2005) — For Vehicles Equipped With Digital Climate Control
- Product Codes: 6445WZ; H4540
- Other Numbers: NFP
Function
The harness provides the electrical network for the air conditioning system, routing power and signal lines between the climate control unit, compressor clutch, pressure switches, evaporator temperature sensors and HVAC actuators. Correct wiring ensures the compressor engages at the right times, sensors communicate accurate temperatures and safety interlocks (pressure cutouts) function properly.
Replacement Procedure
Recommended For Professional Mechanics And Experienced DIYers. Basic Steps:
- Disconnect The Battery Before Starting Work To Prevent Short Circuits And Protect Electronic Components.
- Remove Necessary Interior Trim Panels And Glovebox To Access The HVAC Unit Depending On Model.
- Locate And Unplug All Relevant Connectors From The Old Harness, Label Connectors If Needed To Avoid Confusion.
- Unscrew Or Release Retaining Clips And Carefully Free The Harness From Mounting Points; Take Care Not To Damage Connectors Or HVAC Components.
- Install The New Harness Following The Original Routing, Secure With Clips And Fasteners, And Reconnect All Plugs Firmly.
- Reconnect The Battery And Perform A Functional Test: Turn On Climate Control, Verify Compressor Engagement, Check Sensor Readings And Listen For Abnormal Noises.
Installation Recommendations
- Always Disconnect The Battery Before Removal Or Installation.
- Inspect Connector Pins For Corrosion; Clean And Apply Suitable Dielectric Grease To Improve Long-Term Contact.
- Ensure Correct Routing Away From Sharp Edges, Moving Parts And High-Heat Zones To Avoid Premature Wear.
- Replace Any Damaged Clips Or Mounting Brackets To Prevent Harness Chafing.
- Use OEM-Style Connectors And Confirm Secure Latching To Avoid Intermittent Faults.
Common Failure Reasons
Wiring harnesses for climate systems are durable but can fail due to external factors. Typical causes include:
- Mechanical Damage From Chafing Or Improper Routing Leading To Exposed Conductors.
- Heat And Vibration In Engine Bay/Firewall Areas Causing Insulation Degradation Over Time.
- Connector Corrosion From Moisture Ingress Or Condensation Around The HVAC Unit.
- Rodent Damage Where Wires Are Chewed In Parked Vehicles.
- Accidental Damage During Previous Repairs Or Component Replacement.
Why Choose This Harness
Replacing a faulty or damaged AC harness with a correct BEHR unit restores reliable electrical connections and helps eliminate intermittent climate control faults, compressor failures due to missing engagement signals, or sensor communication errors. Part-number search compatibility increases the chance of a direct fit and faster repair turnaround in workshops.
