This air conditioning pipe is a direct-fit climate tube designed for Citroën C4 Picasso and Grand C4 Picasso models equipped with the 2.0 HDi (RHR) engine. Ideal for professional workshops and skilled DIYers, the pipe restores proper refrigerant routing in the AC system and is commonly searched by part numbers 9653505980, 6477D8, 9685503280 and 6460WY — include these codes when looking up fitment or replacement options.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 Picasso, Grand C4 Picasso
• Product Codes: 9653505980, 6477D8
• Additional Numbers: 9685503280, 6460WY

Function

The climate pipe routes refrigerant between components of the air conditioning system (for example condenser, evaporator, receiver/drier or compressor) and ensures reliable high/low pressure flow. Constructed to withstand system pressures and temperature cycles, the pipe uses dedicated fittings and sealing O-rings to maintain a leak-free connection.

Fitment And Application

Designed for Citroën C4 Picasso and Grand C4 Picasso vehicles with the 2.0 HDi engine (engine code RHR). Use the listed product codes when matching parts: many technicians and parts systems identify this item primarily by its OEM numbers.

Replacement Procedure

1. Work Only With Recovered Refrigerant: Recover refrigerant into an approved recovery machine before any disassembly.
2. Access And Inspect: Remove any engine covers or components that obstruct access to the pipe and inspect surrounding hoses and connections for wear.
3. Disconnect Fittings: Loosen and remove the pipe fittings. Expect O-rings at each connection — these should be replaced whenever the joint is opened.
4. Install New Pipe: Fit the new pipe using new O-rings and correct lubricant (PAG oil type per manufacturer). Ensure proper seating of fittings.
5. Vacuum And Recharge: Evacuate the system to remove moisture and then recharge with the correct refrigerant type and oil quantity per manufacturer specification.
6. Leak And Function Test: Pressurize, check for leaks (electronic leak detector or UV dye), then run the AC system to verify cooling performance.

Installation Recommendations

• Always Replace O-Rings: Use new O-rings of the correct size and material and lubricate them with the specified refrigerant oil before assembly.
• Use Proper Equipment: Refrigerant recovery, vacuum pump and charging equipment are required for a compliant and safe job.
• Follow Manufacturer Torque And Procedures: Tighten fittings to the vehicle maker’s specifications and observe recommended assembly sequences.
• Inspect Related Components: Replace damaged hoses, worn clamps or a saturated receiver/drier to avoid repeat failures.
• Safety First: Wear eye protection and gloves; avoid releasing refrigerant to atmosphere and follow local environmental regulations.

Why The Part Most Often Fails

Common failure causes include corrosion or pitting of metal lines, degradation of O-rings and seals, mechanical damage from road debris or improper routing, and fatigue from vibration and thermal cycling. Small leaks often start at fittings or damaged sections and, if left unchecked, lead to loss of refrigerant and reduced cooling performance.

Ordering Tip: Search by the OEM numbers 9653505980, 6477D8, 9685503280 or 6460WY to quickly find the correct replacement for Citroën C4 Picasso and Grand C4 Picasso 2.0 HDi (RHR) applications.