LR121418 Water Pump for Defender L663 & Range Rover Sport L494 3.0L

Technical Specifications

Cooling System Function in 3.0L MHEV Engines

In Land Rover’s inline-six engines, the water pump circulates coolant through:

• cylinder block cooling channels
• radiator heat exchange circuit
• turbocharger thermal management lines
• hybrid auxiliary cooling loop

Failure of the Land Rover Defender Range Rover 3.0T water pump may lead to:

• coolant leaks from the pump housing
• rising engine temperature during heavy load
• coolant warning messages
• overheating during off-road or towing conditions

These symptoms are commonly reported as Range Rover Sport AJ20P6 coolant leak water pump symptoms in workshop diagnostics.

Common Failure Signs

Technicians often identify Land Rover Defender 3.0T overheating water pump failure signs through several indicators:

• coolant residue around the pump mounting surface
• whining noise from pump bearings
• slow coolant circulation at idle
• engine temperature fluctuations during highway driving
• coolant loss without visible radiator leaks

When these issues appear, replacing the Land Rover Discovery 3.0L MHEV water pump replacement unit becomes necessary to restore stable cooling performance.

FAQ

1. Which Defender models use the LR121418 Water Pump?

It fits both the Defender Station Wagon (L663) and Defender Van (L663) with the 3.0 P400 I6 MHEV engine from 2019/2020 onwards.

2. Does the pump suit the Range Rover L405 3.0 P360 and P400?

Yes. The Range Rover 3.0L Water Pump covers both power outputs (265 kW and 294 kW) on the AJ20P6 engine in the L405 generation.

3. Will this resolve coolant leaks on a 2022 Range Rover Sport?

When the original seal or bearings have worn, fitting the Land Rover Defender Range Rover 3.0T water pump usually stops the leak and returns normal circulation.

4. How long does replacement typically take?

Experienced technicians complete the job in 1.5 to 2.5 hours once the auxiliary drive belt and related components are removed.

5. What are the common signs of water pump failure on these 3.0L engines?

Gradual coolant loss, a whining noise from the front of the engine, or slow temperature climb during sustained high-speed driving.

6. Do you offer volume pricing for trade accounts?

Yes. We provide tiered pricing for distributors and workshops ordering in larger quantities.

7. How quickly can the part reach workshops in Europe?

Orders placed during working hours usually ship the same day and arrive within 7–10 working days via reliable courier routes.

8. Is the pump supplied for OEM or aftermarket use?

This product is intended for aftermarket replacement applications while maintaining OEM-level fitment.

9. Is the cross-reference to T4A41037 confirmed?

Yes. T4A41037 is the Jaguar-equivalent OE part number for the same pump on F-Pace models using the AJ20P6 engine. Both references describe the same physical component. Our replacement covers both applications.

Compatible Vehicle Model