This intake air-coolant heat exchanger is designed for PSA group diesel engines and fits Citroën C8 and Peugeot 807 vehicles with 2.0 and 2.2 HDi engines. The unit transfers engine coolant heat to the intake airflow to support cold-start performance and stable idling in cold conditions. It is supplied with the original OE reference numbers to simplify lookup and ordering.

Key Features

• Direct-fit replacement for PSA OE numbers 9640450780, 144200, 144207.
• Improves intake air temperature management during cold starts.
• Designed for workshop use and competent DIY installers; straightforward mounting points and coolant connections.
• Durable construction to withstand engine bay temperatures and coolant exposure.

Fitment And Compatibility

Primarily intended for:

• Citroën C8 & Peugeot 807
• Engines: 2.0 HDi and 2.2 HDi (PSA diesel platforms)

Always verify fitment using the OE/product codes 9640450780, 144200, 144207 before purchase to ensure compatibility with the exact vehicle VIN and engine variant.

Typical Failure Modes & Symptoms

• Coolant leaks at hose connections or internal cracking leading to low coolant level warnings.
• Soot and debris buildup causing reduced heat transfer and poorer cold-start behaviour.
• Corrosion or galvanic damage where coolant and air interfaces occur.
• Visible coolant traces around intake ducts or inesperable loss of coolant without obvious external leaks.

Replacement And Installation Notes

Recommended for experienced mechanics or competent DIYers. Typical replacement steps include:

• Drain or partially lower the coolant level to avoid spillage when disconnecting the unit.
• Remove any intake hoses or ducting that obstruct access to the heat exchanger.
• Disconnect coolant hoses and be prepared to catch residual coolant; replace any worn clamps or seals.
• Unbolt the heat exchanger from its mounting points, transfer any required brackets or sensors, and fit the new unit with new seals where applicable.
• Refit hoses and ducting, refill and bleed the cooling system to remove air pockets, then check for leaks and correct operation.

Use correct coolant type recommended by the vehicle manufacturer and verify torque settings for clamps and bolts. If uncertain, consult a workshop manual for the specific vehicle year and engine code.

Maintenance Tips

• Inspect coolant hoses and clamps during every service; replace brittle or corroded parts to prevent future leaks.
• Keep intake pathways free of oil and soot; regular service of the EGR and intake system reduces contamination of the heat exchanger.
• Monitor coolant condition and change at recommended intervals to limit corrosion and deposits.

Technical Information

• Manufacturer: PSA Citroën Peugeot
• Model: Citroën C8, Peugeot 807 – Engines 2.0 HDi, 2.2 HDi
• Product Codes: 9640450780, 144200, 144207
• Other Numbers: 9640450780, 144200, 144207

If you need help confirming compatibility with a specific vehicle or VIN, contact your parts specialist with the OE numbers above to avoid incorrect ordering.

This intake filter box with integrated water–air heat exchanger is a direct-fit solution for PSA 2.0 HDi and 2.2 HDi engines. Designed for professional workshops and DIY mechanics, the unit combines air filtration with a coolant-fed heat exchanger to stabilise intake-air temperature and reduce condensation in the intake tract. Commonly searched by OEM and reference numbers (9640454480, 964045780, 1427J3, 144200), this part restores proper air flow and prevents water ingress that can affect engine performance, turbo response and emissions control.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C5, Citroën C8, Peugeot 607, Peugeot 807
• Product Codes: 9640454480, 964045780
• Additional Numbers: 1427J3, 144200

Function and Benefits

The unit houses the air filter element and an integrated water–air heat exchanger. By exchanging heat between engine coolant and the intake air, the exchanger helps to:

• Reduce condensation and water accumulation inside the intake tract.
• Stabilise intake-air temperature for improved cold-start behaviour and combustion consistency.
• Protect downstream components (turbocharger, MAF sensor, EGR) from excessive moisture and contamination.

Fitment and Compatibility

Direct fit for listed Citroën and Peugeot models equipped with 2.0 HDi or 2.2 HDi diesel engines. Always check the reference numbers (9640454480 / 964045780 / 1427J3 / 144200) against the vehicle’s parts catalog when confirming fitment. This item is intended for the intake system where the filter housing and coolant connection points match the OEM layout.

Installation Recommendations

Recommended for installation by experienced technicians or competent DIY mechanics with basic workshop tools. Typical replacement steps:

• Work on a cold engine. If the exchanger is connected to the cooling circuit, relieve system pressure and be prepared to capture any coolant that may spill.
• Disconnect intake hoses, clamps and any electrical connectors (MAF sensor, intake sensors) attached to the housing.
• Unfasten mounting screws/clips securing the filter box and remove the assembly carefully to avoid damage to the exchanger or attached hoses.
• Replace sealing gaskets and hose clamps as needed. Ensure all seals are seated correctly and fastening points are torqued to the manufacturer’s specification.
• After installation, refill and bleed the cooling circuit if it was opened. Start the engine and check for air intake leaks and coolant leaks around the exchanger connections.

Most Common Failure Causes

• Plastic fatigue and cracking from heat cycles and vibration, leading to air leaks or coolant seepage.
• Corrosion or internal blockage of the heat exchanger caused by contaminated or degraded coolant.
• Clogging from dirt, oil or soot in the intake path reducing airflow and performance.
• Damaged seals or hose connections allowing water or air leaks.
• Mechanical damage during removal or reinstallation (broken clips, stripped threads).

Service Advice

There is no fixed service interval for the filter box with heat exchanger; lifespan depends on operating conditions and maintenance. Inspect the unit during major services or when symptoms appear: reduced engine performance, unusual intake moisture, coolant loss, or visible cracks. Replace if leaking, heavily contaminated or mechanically damaged. Use genuine replacement parts or equivalent-quality components and renew seals and clamps during installation to ensure long-term reliability.