Description
Air conditioning refrigerant pipe for Citroën C5 X7 and Peugeot 407.
This replacement AC refrigerant line is designed to fit Citroën C5 II (C5 X7) and Peugeot 407 models and is listed under common OEM references to help you find the correct part quickly. Ideal for professional workshops and experienced DIY mechanics, the pipe restores the sealed refrigerant circuit integrity, preventing leaks and ensuring consistent air conditioning performance. Frequently searched by part number 9659576280 or 647773, this component is a direct-fit solution that matches original routing and connection types.
Functionally, the refrigerant pipe transports cold refrigerant between system components (compressor, condenser, evaporator, dryer/accumulator) while withstanding pressure, temperature swings and vibration. Typical symptoms of a failing line include reduced cooling capacity, visible oil staining along the pipe or fittings, hissing sounds from leaks, and abnormal low/high pressures on the AC gauge set.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C5 II (C5 X7), Peugeot 407
- Product Codes: 9659576280
- Additional Numbers: 647773, NFP
Replacement Guide
- Step 1: Recover Refrigerant Using Approved Equipment — The system must be evacuated of refrigerant with certified recovery equipment before opening the circuit.
- Step 2: Remove Fasteners And Disconnect Fittings — Loosen clamps and threaded fittings, retaining any brackets for reuse if undamaged.
- Step 3: Inspect Mating Components — Check condenser, evaporator, drier/accumulator and compressor connections for corrosion or damage; replace damaged seals or components.
- Step 4: Replace O-Rings And Apply Correct Lubricant — Always fit new O-rings sized to the joint and lubricate with the correct refrigerant oil to ensure a proper seal.
- Step 5: Install New Pipe And Torque To Spec — Position pipe to factory routing, secure brackets and tighten fittings to manufacturer torque values.
- Step 6: Evacuate, Leak-Test And Recharge — Vacuum the system to remove moisture, perform a leak check, then recharge with the specified refrigerant and correct charge mass.
Installation Recommendations
- Use Manufacturer Torque Specifications — Avoid over- or under-tightening fittings to prevent distortion and leaks.
- Always Replace Sealing Elements — Replace O-rings and sealing washers at every service to ensure long-term leak-free operation.
- Perform A Thorough Leak Check — Use dry nitrogen pressure test, electronic leak detector or UV dye as appropriate before final assembly.
- Follow Proper Evacuation Time — Pull vacuum long enough to remove moisture (commonly 30–60 minutes depending on equipment) and verify with a stable vacuum reading.
- Use Correct Refrigerant And Oil — Charge the system with the refrigerant type and oil amount specified by the vehicle manufacturer.
Common Failure Reasons
The most common causes of refrigerant pipe failure are corrosion (especially in regions with road salt), mechanical chafing against bodywork or engine components, vibration-induced fatigue at bends or bracket points, degraded seals and O-rings, and accidental damage during previous repairs. Aging and repeated thermal cycles can also cause material hardening or micro-cracks that lead to slow leaks.
Typical Service Life: Depending on driving conditions and environment, refrigerant pipes can last many years but commonly begin to show issues after 8–15 years. Regular inspections during routine AC service help catch developing leaks early.
Keywords for Search: Citroën C5 AC refrigerant line, Peugeot 407 AC pipe, part number 9659576280, 647773, air conditioning pipe replacement, AC leak repair.
