Land Rover Discovery 4 L319 Thermostat Coolant Hose Pipe AH22-8B273-AA

The Land Rover 4 L319 Thermostat Coolant Hose is a component from the Cooling System Hoses and Pipes category, designed to operate within the coolant circuit around the thermostat. It is responsible for the stable flow of coolant, which translates to the correct operating temperature of the engine and the safe functioning of the entire cooling system.

Specifications and technical data

• SKU: AH22-8B273-AA
• Mark: Land Rover
• Condition: Used
• OEM Part Number: AH22-8B273-AA
• Substitutable numbers: AH22-8B273-AA, AH228B273AA
• Part type: Pipe
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The thermostat coolant hose in Land Rover L319 series models operates in close proximity to the thermostat, ensuring controlled fluid flow between key system components. A properly selected hose:

• maintains the sealing of the cooling circuit in the thermostat area,
• stabilizes the direction of coolant flow,
• reduces the risk of localized overheating at critical engine points,
• supports the correct operation of the thermostat and radiator.

Thanks to its appropriate shape and compatibility with factory mounting points, the hose works with other cooling system components without requiring modifications.

Original Origin and Fitment

The hose comes from the Land Rover brand offering, which means factory geometry, connection diameters, and mounting points are preserved. Original manufacturing translates to:

• secure fit with thermostat spigots and other hoses,
• compatibility with factory brackets and routing in the engine bay,
• preservation of the coolant flow path designed by the manufacturer.

Such a fit minimizes the risk of stress, twisting, or kinking of the hose, which could reduce cooling efficiency or lead to leaks.

Performance Characteristics and Installation

As a component from the Cooling System Hoses and Pipes category, this hose is designed to operate in an environment of high temperatures and variable coolant pressure. The hose construction allows for:

• stable operation within typical engine operating temperature ranges,
• compatibility with factory clamps and connectors,
• installation in place of a worn or leaking hose without system modifications.

The product is offered in a Used condition, allowing for an economical replacement while maintaining original manufacturing standards. Before installation, it is recommended to inspect other cooling system components, such as the thermostat, radiator, or expansion tank, to restore the full efficiency of the entire circuit in a single service operation.

Benefits of Using an Original Coolant Hose

Using a thermostat coolant hose dedicated to the Land Rover 4 L319 offers a number of practical benefits:

• Stable engine operating temperature – proper coolant flow reduces the risk of engine overheating.
• Factory fitment – no need to adapt universal hoses, which shortens service time.
• System compatibility – the hose works with the original thermostat and other hoses, maintaining the manufacturer's designed circuit characteristics.
• Economical repair – a used OEM part allows for reduced service costs while maintaining proper functionality.

More About the Cooling System and Related Parts

If you need other Land Rover Cooling System Hoses and Pipes, check out the Land Rover cooling system hoses and pipes available in our store to select components for complete cooling system servicing for your vehicle.

To better understand the impact of hoses, thermostats, and radiators on engine durability, it is worth reading the guide Engine Cooling System – Overheating, Repair, and Used Radiators, which discusses common overheating symptoms and practical tips for cooling system diagnostics and servicing.