Description
Air–water heat exchanger filter box for CITROËN C5, C8 and PEUGEOT 607, 807 with 2.0 HDi or 2.2 HDi engines
This intake filter box with integrated coolant-to-air heat exchanger is a direct-fit replacement for many PSA 2.0 HDi and 2.2 HDi applications. Designed to house the engine air filter while routing coolant through a compact exchanger, the unit helps manage intake-air temperatures and supports related systems that rely on controlled air temperature. Commonly referenced under OEM part numbers, this assembly is a practical spare for workshops and DIY mechanics servicing Citroën and Peugeot diesel engines.
Function And Application
The assembly combines the airbox function with a coolant heat-exchanger section. It secures and seals the air filter, reduces intake noise, and conditions intake air temperature via the coolant circuit. On affected PSA diesel engines the heat-exchanger can assist with intake preheating or interaction with EGR/recirculation circuits depending on vehicle configuration.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5, Citroën C8, Peugeot 607, Peugeot 807 – Engines: 2.0 HDi, 2.2 HDi
- Product Codes: 9640454480, 1427J3
- Other Numbers: 964045780, 144200
Fitment And Compatibility
Use the listed product codes when searching for compatibility. The unit is intended for the engine and model combinations stated above. Because intake routing and ancillaries vary across model years and engine variants, verify visual match of mounting points, hose diameters and connector locations before installation.
Installation Recommendation
- Park Vehicle Safely And Work On A Cool Engine. Disconnect Negative Battery If You Will Disturb Electrical Connectors Or Sensors.
- Remove Engine Cover And Intake Piping To Access Airbox. Release Hose Clamps And Unplug Any Sensors (Mass Air Flow If Present) Carefully.
- Unbolt Mounting Fasteners And Detach Airbox From Rubber Mounts. If The Unit Incorporates Coolant Connections, Expect Minor Coolant Loss—Have Drain Pan Ready And Follow Cooling System Service Procedures.
- Transfer Any Required Brackets Or Sensors To The New Unit. Replace All Seals And Clamps Where Possible. Reinstall In Reverse Order And Check For Leaks And Secure Fitment.
- Replace Air Filter Simultaneously To Ensure Optimal Performance.
Why The Part Commonly Fails
Typical failure modes include carbon and oil contamination from EGR and turbocharger systems that clog passages or degrade seals, cracks and deformation from heat cycling and vibration, gasket or seal failure causing air or coolant leaks, and broken mounting tabs. Vehicles with high mileage or heavy soot loading are more likely to show symptoms such as reduced airflow, coolant loss, or intake air leaks.
Maintenance And Lifespan
Lifespan Depends On Driving Conditions And Maintenance. On Diesel Engines With Strong EGR Or Oil Carryover, Deposits Can Accumulate Faster, Increasing The Risk Of Blockage Or Seal Degradation. Regular Inspection During Air Filter Service Intervals Will Help Spot Early Problems.
Practical Tips For Workshops And DIYers
- Always Compare Mounting Points, Hose Diameters And Connector Locations Against The Old Unit Before Final Fitment.
- Replace Clamps And Seals When Disturbed To Prevent Future Leaks.
- Clean Surrounding Intake And EGR Components To Reduce Recontamination Of The New Unit.
Part numbers and compatibility references are included above to help technicians and self-repairers locate the correct replacement quickly. Order this air–water heat exchanger filter box by OEM code for faster identification and smoother workshop turnaround.
