Description
Air conditioning pipe for Citroën C4 Grand Picasso. For vehicles with 1.6 HDi 9HZ engine and others.
This high-quality used air conditioning pipe is a direct-fit replacement for Citroën C4 Grand Picasso applications and is ideal for professional workshops and experienced DIY mechanics. Frequently searched by its reference numbers, this part restores proper refrigerant flow between system components, stops leaks and helps recover full cooling performance. Supplied as a ready-to-install unit, it is a practical and cost-effective solution when the original line is corroded, damaged or leaking.
Key Benefits
- Direct fit for Citroën C4 Grand Picasso models with compatible 1.6 HDi 9HZ engines.
- Commonly searched by OE numbers 9653505780 and 6477D5—easy to find and order.
- Restores system integrity and prevents refrigerant loss, improving cooling efficiency.
- Suitable for mechanics and skilled DIY installers familiar with A/C service procedures.
Function And Typical Faults
The air conditioning pipe transports refrigerant between key components of the climate system (compressor, condenser, dryer/accumulator and evaporator). It ensures sealed, pressure-rated connections and routing to withstand engine bay temperatures and vibrations. Common reasons for replacement include:
- Corrosion and perforation due to road salt and moisture.
- Mechanical damage from impacts or abrasion against other components.
- Leakage at joints and sealing rings (O-rings) due to ageing or improper seating.
- Cracks developing from heat cycling and vibration over time.
Installation Recommendations
Replacement requires basic A/C service experience and the correct equipment. Follow a workshop-standard procedure:
- Recover refrigerant with certified recovery equipment before any work on the system—do not vent refrigerant to atmosphere.
- Remove damaged pipe and inspect adjacent components (compressor, dryer/accumulator, condenser) and hoses for related damage.
- Replace all relevant O-rings and sealing elements with correctly sized, lubricated seals; use the manufacturer-specified lubricant.
- Perform vacuuming of the system and refill/recharge the refrigerant and oil according to the vehicle manufacturer’s specifications.
- Check for leaks and measure system pressures and cooling performance after installation.
Why This Part Most Commonly Fails
Exposure to road salt, moisture and temperature extremes leads to corrosion and eventual perforation. Vibration and engine movement can cause chafing or fatigue cracks, while old or displaced O-rings create slow leaks. Damage from collisions or careless routing during other repairs is also a frequent cause of failure.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C4 Grand Picasso (C4 Picasso)
- Product Codes: 9653505780, 6477D5
- Other Numbers: None specified
Practical Tips For Fitment
- Verify that the engine code (1.6 HDi 9HZ) matches the vehicle application before installation.
- Always replace sealing rings when assembling A/C connections to ensure a durable seal.
- Use appropriate personal protective equipment and work in a well-ventilated area when handling refrigerant and oils.
- If unsure about system evacuation or recharge, have the service performed by a workshop with A/C service equipment.
Searchable by OE references 9653505780 and 6477D5—order now to replace a leaking or damaged A/C line and restore reliable cooling to your Citroën C4 Grand Picasso.
