Product Overview

This air conditioning (A/C) pipe is a direct-fit replacement commonly used on selected Citroën and Peugeot models. It restores reliable refrigerant circulation between components in the HVAC system and is often searched for by its OEM part numbers (9658227780, 647738). Ideal for professional garages and DIY mechanics who need a durable pipe that meets factory fitment standards.

Key Benefits

• OEM-referenced fit for clean installation and correct alignment with existing A/C components.
• Helps stop refrigerant leaks that reduce cooling performance and can damage other A/C parts.
• Suitable for tradespeople and experienced DIYers — commonly located and replaced during A/C service or component overhaul.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot OEM)
• Model: Citroën C4; Peugeot 307 (also fitted on some related PSA models)
• Product Codes: 9658227780, 647738
• Other Numbers: 647738 | 9658227780

Compatibility Notes

Primary fitment is indicated for Citroën C4 and Peugeot 307 platforms. The same pipe design may appear on related PSA group models with similar HVAC layouts; always compare the part number and connector positions with the unit being replaced.

Installation Recommendations

Replacement of an A/C pipe requires correct A/C service procedures and tools. Recommended steps:

• Recover refrigerant using certified recovery equipment before opening the system. Do not release refrigerant to the atmosphere.
• Remove any trim or brackets blocking access to the pipe. Note routing and support points to ensure correct refitment.
• Disconnect fittings, replace all associated O-rings/seals with correctly sized new O-rings lubricated with appropriate PAG oil.
• Refit the new pipe, torque fittings to manufacturer values where available, and ensure proper clamp/support positioning to avoid chafing.
• Evacuate the system with a vacuum pump, perform a leak test, then recharge with the correct refrigerant type and nominal charge (observe vehicle-specific refrigerant and oil specifications, typically R134a for many older PSA models).
• Operate the A/C system and check pressures and temperatures to confirm correct operation.

Why This Part Fails

Common causes of A/C pipe failure include corrosion from road salt and moisture, mechanical damage from impacts or rubbing, and degradation of joints and O-rings over time. Failure typically presents as refrigerant leaks, loss of cooling efficiency, or visible oil residue around connections. Vibration and age-related embrittlement of hoses and seals accelerate wear.

Practical Tips

• When replacing the pipe, always fit new O-rings and use the correct lubricant to ensure sealing.
• Inspect adjacent components (compressor, condenser, evaporator, receiver/drier) for contamination or damage—A/C system failures are often multi-component.
• After installation, monitor the system for a short period to confirm there are no slow leaks and that cooling performance is restored.

Suitable For

Designed for garages and seasoned DIY mechanics working on Citroën and Peugeot vehicles who require a reliable OEM-referenced air conditioning pipe to restore system integrity and cooling performance.

Product Overview

This air conditioning pipe is designed for Citroën and Peugeot models equipped with R134a refrigerant circuits. It replaces deteriorated or damaged refrigerant lines to restore proper coolant flow, prevent leaks and ensure efficient air conditioning performance. The part is commonly referenced by manufacturer codes and OE numbers, which makes it easy for technicians and DIY enthusiasts to search and identify the correct replacement.

Key Benefits

• Direct-fit replacement for specified Citroën and Peugeot models.
• Restores system integrity and helps prevent refrigerant leakage.
• Maintains correct refrigerant flow for efficient climate control operation.
• Supplied to match original connection types and mounting points.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C4, Citroën C4 II, Citroën C5 II, Peugeot 307, Peugeot 407
• Product Codes: 6460JA, 6460JC, 6460PW, 647736, 647738
• Additional Numbers: R134a

Compatibility Notes

Compatibility is primarily determined by the vehicle model and the original part number. These pipes are intended for the models listed above; however, variations in engine, production year, and factory options can affect fitment. Always verify the reference number against the part being replaced when possible.

Installation Recommendations

• Have the refrigerant properly recovered by a certified recovery machine before removing the old pipe—do not vent refrigerant to the atmosphere.
• Replace all associated O-rings and seals with correct-sized, refrigerant-compatible O-rings lubricated with the manufacturer-recommended PAG oil.
• Inspect mating connections, receiver-drier/accumulator and compressor for contamination or damage; replace if contaminated to avoid premature failure of the new pipe.
• Perform a vacuum test on the evacuated system to check for leaks and moisture (recommended vacuum hold time per service manual).
• Recharge the system with the correct type and amount of refrigerant (R134a) and oil as specified by manufacturer data.
• After charging, run system and perform leak check (UV dye or electronic leak detector) and verify correct pressures and temperatures.

How The Part Is Replaced

Replacement typically involves recovering the refrigerant, disconnecting the pipe fittings (keeping track of the orientation and any brackets), removing the old line, fitting new O-rings and installing the new pipe. Secure all brackets and retighten fittings to the correct torque. Evacuate and recharge the system, then verify operation and inspect for leaks. Depending on vehicle layout, some dash or engine bay components may need to be moved for access—follow service manual procedures.

Common Failure Causes

• Corrosion from road salt or moisture attack on metal sections, especially in regions with harsh winters.
• Mechanical damage from impacts, chafing or contact with moving parts or heat sources.
• Age-related deterioration of joints and O-rings leading to refrigerant oil and gas leakage.
• Contamination inside the A/C system (debris, moisture) that accelerates corrosion or clogs components.

Why Replace This Part

A leaking or restricted air conditioning pipe reduces cooling performance, can allow moisture into the system, and may lead to compressor damage if left unaddressed. Replacing the defective pipe and renewing seals restores system reliability and prevents further component failures.

Advice For Professionals And DIY Mechanics

This part is suitable for professional workshops and experienced DIY mechanics familiar with A/C service procedures. Proper refrigerant handling equipment and knowledge of A/C system charging and leak testing are essential for safe and legal installation. If in doubt, consult the vehicle service manual or a trained technician.