Performance Water Pump & Thermostat Kit for Land Rover Range Rover (2014-2020) 3.0L

Heavy-Duty Aluminum Cooling System Refresh Kit for 2014-2020 Land Rover Range Rover (L405)

What it Does: The Performance Water Pump & Thermostat Kit replaces failure-prone factory plastic crossover pipes, the thermostat assembly, and the mechanical water pump on the 2014-2020 Land Rover Range Rover to prevent catastrophic coolant loss and rapid thermal runaway.

The Stock Land Rover Range Rover Cooling System Weakness

The factory AJ126 3.0L supercharged V6 relies on multi-piece molded plastic coolant crossover pipes routed under the supercharger manifold. Under continuous thermal cycling and sustained cooling pressures, the seam-welded plastic becomes brittle, resulting in hairline cracks, warped thermostat housings, and sudden pressurized coolant dumps into the engine valley. Furthermore, stock plastic bleeder plugs frequently shear during routine service, and factory water pump mechanical shaft seals weep prematurely, threatening severe cylinder head distortion if operating temperatures spike.

The Engineering Solution

This comprehensive refresh kit replaces vulnerable OEM plastic channels with cast and formed aluminum coolant crossover pipes that resist extreme engine bay heat soak and eliminate seam failure permanently. Matched with a high-flow mechanical water pump engineered for cavitation-free coolant circulation, a calibrated thermostat assembly with integrated sensor, and reinforced outlet hoses featuring rugged copper fittings and a solid copper bleeder plug, this direct replacement assembly restores pressure integrity across the entire primary cooling loop.

What's Included

• 1 Thermostat with Integrated Sensor
• 1 Aluminum Coolant Crossover Pipe Assembly
• 1 Mechanical Water Pump
• 1 Thermostat Outlet Hose with Copper Fittings
• 1 Copper Bleeder Screw & Crossover Plug
• 1 Heater Outlet Hose

Technical Specifications

Compatibility

• 2014-2020 Land Rover Range Rover 3.0L V6 Supercharged (AJ126)
• Also compatible with select AJ133 5.0L Supercharged V8 applications matching listed OEM references

Frequently Asked Questions & Fitment Warnings

Does this fit the L405 Range Rover?

Yes, this is a direct fit for the 2014-2020 Land Rover Range Rover equipped with the AJ126 3.0L supercharged engine. Does not fit naturally aspirated engines; always verify your displacement, induction setup, and original part numbers prior to ordering.

Do I need to bleed the cooling circuit after installation?

Yes, pulling a full vacuum fill followed by an automated coolant bleed cycle is required on the AJ126 to evacuate air pockets from the cylinder blocks and supercharger heat exchangers.

The Land Rover Precision Standard

Engineered to exact European thermal tolerances, this metal upgrade rectifies original equipment material shortcomings without triggering check-engine codes or compromising ECU-driven coolant temperature feedback.