Range Rover Vogue L405 Thermostat Housing 4.4 SDV8 Diesel AL3Q-9K478-DB

Range Rover Vogue L405 Thermostat Housing 4.4 SDV8 Diesel is a component from the Thermostats and housings category, designed for the cooling system of a diesel engine. It ensures stable coolant flow and proper interaction with the thermostat in the 4.4 SDV8 Diesel unit, which translates into safe engine operating conditions.

Specifications and technical data

• SKU: AL3Q-9K478-DB
• Mark: Range Rover
• Condition: Used
• OEM Part Number: AL3Q-9K478-DB
• Substitutable numbers: AL3Q-9K478-DB, AL3Q9K478DB, LR022695
• Fuel type: Diesel
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat housing in the 4.4 SDV8 Diesel engine is responsible for the precise seating of the component that regulates the engine's operating temperature and for the leak-proof routing of coolant. A correctly selected part helps maintain an optimal temperature range, reduces the risk of overheating, and supports even engine warm-up, which is important for both component durability and performance stability.

In the case of diesel units such as the 4.4 SDV8, the proper operation of the thermostat housing is particularly important due to higher thermal loads and longer duty cycles under heavy load. Using the correct element from this group allows for maintaining the consistency of the cooling system with the manufacturer's factory specifications.

Technical characteristics and fitment

The presented thermostat housing comes from the Range Rover brand and is structurally matched to the 4.4 SDV8 Diesel unit used in the Vogue L405 model. This means compatibility with the factory layout of ports, flow channels, and mounting points, which facilitates installation and reduces the need for additional modifications in the engine bay.

The element belongs to the Thermostats and housings group, which is why it is designed to work with the cooling system, hoses, and temperature sensors intended for this engine unit. Such fitment promotes the maintenance of connection tightness and stable coolant flow throughout the entire engine operating range.

Product condition and service application

The thermostat housing is offered as a used part, making it an attractive solution for service repairs where the priority is to maintain compliance with the original design while optimizing costs. This type of component is suitable for replacing a damaged housing, leaking cooling system elements, or during a comprehensive service of the 4.4 SDV8 Diesel unit.

Choosing an original housing from this group allows for reducing the risk of fitment issues that may occur with parts of uncertain origin. It is a practical solution for workshops specializing in the Range Rover brand and for users who want to maintain the consistency of the cooling system with factory design assumptions.

Benefits of using the correct thermostat housing

• maintaining a stable operating temperature for the 4.4 SDV8 Diesel engine,
• reducing the risk of overheating and local thermal overloads,
• maintaining proper coolant circulation throughout the entire system,
• better cooperation with the thermostat and other cooling system components,
• consistency with the factory design of the Range Rover Vogue L405 model.

Thanks to these features, the thermostat housing is a functional element that restores the proper operating conditions of the engine unit after a failure or during scheduled service maintenance.

Part selection by numbers and additional support

When selecting elements from the Thermostats and housings group for a specific engine version, it is worth verifying compatibility using catalog numbers and engine unit parameters. This helps avoid installation problems and ensures full compatibility with the vehicle's cooling system. In workshop practice, this approach shortens repair time and reduces the risk of needing to disassemble components again.

If you want to organize the verification process and are interested in how to effectively check component compatibility using manufacturer markings, a guide describing practical methods for working with catalog numbers may be useful – you can find it in the article Buying parts online without risk – 5 proven ways to verify component compatibility.

If you are planning a comprehensive repair or upgrade of the engine area in your Range Rover and need other elements from the same group, such as housings, bodies, or thermostat assemblies, check the available parts in the Range Rover Thermostats and housings category.