Symptoms
Coolant smell after driving, slowly falling coolant level or 'low coolant' warning, crusty coolant around the front of the engine or the back of the block, rising temperature under load.
The fix, step by step
- Drain the coolant.
- Remove the engine covers and air intake to reach the front crossover (water pump outlet to block, LR018275) and the rear heater manifold.
- Pull the pipes and make sure no broken pipe ends or O-rings stay behind in the block.
- Clean the ports, fit new O-rings lubricated with coolant (not grease), and seat the new pipes squarely.
- Owners warn against cheap copies and fit genuine or aluminium parts.
- Replace the water pump and thermostat while you're in there, then refill with the correct 50/50 coolant and bleed the system.
Tools & part numbers
- Metric sockets, hose-clamp pliers, pick for old O-rings, drain pan
- genuine LR018275 crossover, rear heater manifold LR122709, water pump LR097165 (per Lucky8 listings), O-rings LR010800
Where to buy the parts
Hunting a used or discontinued part? Search eBay Motors for Land Rover LR4 / Discovery 4 parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.