Range Rover L322 Radiator Coolant Overflow Tank Reservoir PCF000030 1H4Z8K218AA

Range Rover L322 Radiator Coolant Overflow Tank Reservoir is a cooling system component designed to function as an overflow and buffer tank for coolant. It ensures stable engine operating conditions by allowing for the compensation of fluid volume changes at different temperatures and the safe discharge of excess coolant.

Specifications and technical data

• SKU: PCF000030
• Mark: Range Rover
• Condition: Used
• OEM Part Number: PCF000030
• Substitutable numbers: PCF000030, 1H4Z8K218AA, 1H4Z-8K21-8AA
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented reservoir belongs to the Expansion Tanks category and is structurally matched to the cooling system in Range Rover vehicles. Its task is to maintain the proper level of coolant, absorb the overpressure generated during engine warm-up, and allow the fluid to return to the circuit after cooling down.

A properly selected expansion tank helps reduce the risk of engine overheating, air locks in the system, and uncontrolled leaks. As a result, the cooling system operates more stably, and the engine's operating temperature remains within the range specified by the manufacturer.

Technical characteristics and fitment

This is an OEM group part designed for Range Rover, which means it maintains the correct geometry of the connectors, mounting points, and housing shape compared to the factory solution. Such fitment facilitates installation in the engine compartment and ensures compatibility with hoses and other cooling system components.

The product has an assigned part number and interchangeable numbers, which facilitates compatibility verification with a specific vehicle version. When selecting, it is recommended to compare the previously used reservoir and consult the parts catalog to ensure proper fit and connection tightness.

Condition of the item and service application

The offered expansion tank is a used item, which makes it an attractive solution for service repairs when the priority is cost optimization while maintaining the original design. This type of part is particularly suitable in situations where the existing reservoir has cracked, suffered thermal deformation, or shows leaks at the connectors.

Replacing the expansion tank is also recommended as a preventive measure during work related to cooling system upgrades, e.g., after a water pump failure, radiator damage, or during long-term operation at elevated temperatures. Using the original design helps maintain the operating parameters of the system as intended by the manufacturer.

Benefits of installation and operational tips

Selecting the correct expansion tank for the Range Rover L322 allows you to:

• maintain a stable coolant level across the entire engine operating temperature range,
• minimize the risk of engine overheating,
• limit the formation of air pockets in the system,
• maintain the correct operating pressure in the cooling circuit.

During installation, it is recommended to check the condition of the hoses, clamps, and the cooling system cap. After replacing the reservoir, it is worth performing a thorough bleeding of the system and monitoring the fluid level during the first engine operating cycles to confirm tightness and proper circulation.

Additional materials and related items

To better understand the impact of the expansion tank and other components on engine durability and symptoms of overheating, it is worth checking out the guide on cooling system diagnostics and repairs: Engine cooling system – overheating, repair, and used radiators.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Range Rover and need other items from the same group, such as additional reservoirs, mounting elements, or related components, check the available parts in the Range Rover Expansion Tanks category.