Land Rover Discovery 4 L319 3.0D 306DT Intercooler Air Charge Pipe AH22-9G738-AC

The Land Rover Discovery 4 L319 3.0D 306DT Intercooler Hose AH22-9G738-AC is an original intake system component from the Hoses, Tubes, and Pipes category, designed for diesel engines. It ensures a sealed and stable connection between the intercooler and other intake components, which translates to correct boost pressure and smooth engine operation. This is a practical solution for users who want to restore the factory performance parameters of the turbocharged diesel engine in their Discovery 4.

Specifications and technical data

• SKU: AH22-9G738-AC
• Mark: Land Rover
• Condition: Used
• OEM Part Number: AH22-9G738-AC
• Substitutable numbers: AH22-9G738-AC, AH229G738AC
• Fuel type: Diesel
• Part type: Pipe
• Category: Hoses, Lines & Pipes

Purpose and Role in the Intake System

The intercooler hose in the Land Rover Discovery 4 L319 3.0D 306DT is responsible for transporting compressed, cooled air from the charge air cooler to the intake manifold. In a turbocharged Diesel engine, stable air delivery is crucial for:

• maintaining proper boost pressure across the entire RPM range,
• correct mixture composition and smooth engine operation,
• limiting power loss resulting from leaks or hose deformation,
• maintaining the correct operation of the boost control and exhaust emission systems.

A well-chosen intercooler hose helps avoid typical symptoms of damage, such as a loss of acceleration, excessive smoke, or the engine entering limp mode.

Hose Construction and Fitment for Discovery 4

This component has been specifically designed for the intake system in the Discovery 4 L319 with the 3.0D 306DT engine, ensuring:

• factory-correct air routing between the intercooler and subsequent intake sections,
• appropriate bend geometry and internal diameter matched to the original spigots,
• compatibility with original clamps and mounting points in the engine bay,
• stable operation within the typical temperature and pressure ranges for a turbocharged diesel engine.

By maintaining the original hose geometry, airflow remains predictable, and the engine control unit operates under conditions close to factory specifications.

Benefits of Using an Original Intercooler Hose

Using an intercooler hose dedicated to the Land Rover Discovery 4 L319 3.0D 306DT practically allows you to:

• reduce the risk of intake system leaks under higher engine load,
• maintain stable boost parameters without uncontrolled pressure drops,
• ensure compliance with the factory operating characteristics of the turbocharger and intercooler,
• minimize adaptation issues for the control unit after component replacement.

For users who operate their Discovery 4 in demanding conditions, such as towing or off-roading, a properly selected intercooler hose is a crucial element for the reliability of the entire boost system.

Application in Diesel Engines

In turbocharged Diesel engines, the intercooler hose operates under increased pressure and in variable thermal conditions. A correctly selected component:

• provides adequate rigidity while being resistant to vibrations,
• reduces the risk of micro-cracks and abrasions at contact points with other components,
• maintains seal integrity even with frequent changes in load and exhaust gas temperature.

This ensures a stable intake system and allows the engine to maintain predictable torque characteristics throughout its operating range.

Land Rover Hoses, Tubes, and Pipes – Selecting Parts for Discovery 4

If you also need other components from the Hoses, Tubes, and Pipes category dedicated to this brand, check out the Land Rover hoses, tubes, and pipes available in our assortment to select complete solutions for your vehicle's intake, cooling, or vacuum system.

To compare the characteristics of different diesel engines and their aftermarket running costs, you can read an analysis of popular BMW engines – details can be found in the article BMW N47 vs M57 / M57N / M57N2 – Ranking of Legendary Diesels, which helps to better understand the specifics of modern diesel engines and the importance of quality ancillary components.