Range Rover Sport L494 Thermostat Housing Coolant Unit D300 AL3Q-9K478-DB

Range Rover Sport L494 Thermostat Housing Coolant Unit D300 is a cooling system component designed for diesel engines, responsible for the precise routing of coolant and the stabilization of the engine's operating temperature. Thanks to a design that meets the OEM Range Rover standard, the housing ensures a proper fit with the factory system and maintains the performance parameters of the D300 engine. This is a solution for users looking for a proven component for professional repair or replacement within the cooling system.

Specifications and technical data

• SKU: LR125484
• Mark: Range Rover
• Condition: Used
• OEM Part Number: LR125484
• Substitutable numbers: K6D3-8575-AB, K6D38575AB, LR125484, K6D3-8575-AC, K6D38575AC
• Fuel type: Diesel
• Category: Thermostats & Housings

Purpose and function in the cooling system

The Range Rover Sport L494 Thermostat Housing Coolant Unit D300 operates within the diesel engine cooling system, responsible for the correct seating of the thermostat and the controlled flow of coolant between the engine block and other system components. A properly selected housing:

• stabilizes the operating temperature of the diesel engine,
• reduces the risk of engine overheating or undercooling,
• supports even distribution of coolant throughout the entire circuit,
• ensures a tight connection with cooling system hoses and connectors.

By maintaining factory geometry and mounting points, the housing works with the stock cooling system in the Range Rover Sport L494 with the D300 unit, without the need for structural modifications.

Compatibility and OEM standard

The product belongs to the Thermostats and housings group, meaning it has been designed specifically for operation in the engine zone, in the immediate vicinity of components exposed to high temperatures and variable pressure. Using a solution that complies with the factory Range Rover standard allows for maintaining:

• the correct position of the thermostat relative to the cooling channels,
• the proper connection diameters for coolant hoses,
• adequate rigidity and resistance to thermal loads typical for diesel engines.

As a result, the housing is a suitable choice when replacing a worn or damaged component in the factory cooling system, especially where maintaining the original performance characteristics of the engine is essential.

Performance characteristics of the used component

The offered thermostat housing comes from the used parts segment, which allows for economical repair while maintaining a component consistent with the factory Range Rover specification. This type of element is particularly useful in situations where:

• a quick replacement of a damaged housing is necessary without interfering with other cooling system components,
• maintaining the original design and mounting points is a priority,
• compatibility with existing hoses and diesel engine accessories is important.

Before installation, a standard inspection of tightness, mating surfaces, and mounting sockets is recommended to ensure proper system operation after replacement.

Benefits of use in the D300 diesel engine

Diesel engines, such as the D300, operate under specific thermal conditions, which is why a properly selected thermostat housing has a direct impact on:

• operating temperature stability under loads characteristic of diesel units,
• maintaining proper engine thermal efficiency,
• reducing the risk of localized overheating in the cylinder head and block area.

A properly functioning cooling system translates into a longer engine service life and stable operation in both urban and extra-urban conditions.

Expanding the cooling system in Range Rover

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 additional housings, thermostat bodies, or related cooling system components, check out the available parts in the Range Rover Thermostats and housings category.

For users interested in a broader look at the impact of engine operating temperature on performance and accessory durability, including components working with the exhaust system, the following guide article may be helpful: Performance exhaust system: used manifolds and sports catalytic converters on the road.