Manual:LAND ROVER Range Rover Supercharged 2015Page:48843 / 73010



Engine Coolant Level Low With No Visible Loss Of Coolant (JLRTB02127NAS5) — 2015 Land Rover Range Rover Supercharged Service Manual

Engine Coolant Level Low With No Visible Loss Of Coolant (JLRTB02127NAS5)

WARNING: This page is about the Range Rover Base, which is a different variant/trim than selected.
Publication date: 2025-03-28
Reference number: JLRTB02127NAS5
Supersedes refnos: JLRTB02127NAS, JLRTB02127NAS2, JLRTB02127NAS3, JLRTB02127NAS4

ENGINE COOLANT LEVEL LOW WITH NO VISIBLE LOSS OF COOLANT

ENGINE COOLANT LEVEL LOW WITH NO VISIBLE LOSS OF COOLANT

SERVICE CAMPAIGN BULLETIN

Reference Number(s): JLRTB02127NAS5, Date of Issue:  March 28, 2025
LAND ROVER: All Models
SECTION: 303-03A
NOTE: The information in Technical Bulletins is intended for use by trained, professional Technicians with the knowledge, tools, and equipment required to do the job properly and safely. It informs these Technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by 'do-it-yourselfers'. If you are not a Retailer, do not assume that a condition described affects your vehicle. Contact an authorized Land Rover service facility to determine whether this bulletin applies to a specific vehicle.

CONDITION SUMMARY

SITUATION: 

A customer may express a concern that there is a 'Coolant Level Low' message displayed on the instrument panel cluster and the coolant level low or close to minimum, or that the coolant level requires frequently topping up.

CAUSE: 

Permeation of water content from the engine coolant through plastic pipes.

ACTION: 

Follow the Service Instruction below.

The following applies to: 

All Vehicles

PARTS

NOTE:
  • *When stock of 104123458 is depleted order 104123633.
  • **An allowance equivalent to 5.00 Sterling has been allocated to locally source engine coolant.
PARTS INFORMATION

PART NUMBER DESCRIPTION QUANTITY
*104123458 or 104123633 Coolant Expansion Tank 1
**ZZZ001 Engine Coolant 5

The following applies to: 

INGENIUM I6 3.0L Petrol/INGENIUM I6 3.0L Petrol PHEV Vehicles Only

PARTS

NOTE:
  • *When stock of 202123501 is depleted order 202123527.
  • **The 4 undershield fixing retainers (LR165498) are required for the Plug-in Hybrid Electric Vehicle (PHEV) vehicles only  .
PARTS INFORMATION

PART NUMBER DESCRIPTION QUANTITY
*202123501 or 202123527 Fuel Supply Line 1
202123508 Fuel Supply Line to Expansion Tank Clip 1
LR185830 Fuel Supply Line to Vapour Damper Bracket Clip 1
**LR165498 Undershield Fixing Retainer 4

TOOLS

G16999736

JLR-1839 

Cooling system pressure tester

G16999737

JLR-303-1720-02 

Coolant System Pressure Tester Cap and Adapter

WARRANTY

NOTE:
  • Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only. Use TOPIx to obtain the latest repair time.
  • The JLR claims submission system requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
WARRANTY INFORMATION

DESCRIPTION SRO TIME (HOURS) CONDITION CODE CAUSAL PART
Cooling System Pressure Test 26.10.07 0.2 * LR151660
Coolant Expansion Tank 26.15.01 0.5 * LR151660
Fuel Supply Line - Range Rover - INGENIUM I6 3L Petrol 19.40.35 3.0 * LR178362
Fuel Supply Line - Range Rover Sport - INGENIUM I6 3L Petrol 19.40.35 3.0 * LR178362
Fuel Supply Line - Range Rover - INGENIUM I6 3L Petrol - PHEV  19.40.35 3.2 * LR178362
Fuel Supply Line - Range Rover Sport - INGENIUM I6 3L Petrol - PHEV  19.40.35 3.2 * LR178362
Cooling System Concentration Check 26.10.24 0.1 * LR151660
NOTE: Normal Warranty procedures apply.

COOLING SYSTEM PRESSURE TEST

WARNING: Injury such as scalding could be caused by escaping steam or coolant. The vehicle cooling system must be cool prior to completing this procedure.
CAUTION:
  • Engine coolant can damage the paint finished surfaces. If spilt, immediately remove the fluid and clean the area with water.
  • Never remove the coolant expansion tank filler cap under any circumstances while the engine is operating. Failure to follow this instruction may result in damage to the engine.
  • Mating faces must be are clean and free of foreign material.
NOTE:
  • This procedure contains some variation in the illustrations depending on the vehicle specification, but the essential information is always correct.
  • This procedure contains illustrations showing certain components removed to provide extra clarity.
  1. G16999738

    Inspect the coolant expansion tank.

    • If coolant expansion tank 'B'  is installed do not  continue with this bulletin.

      Repair as necessary with reference to TOPIx.

    • If coolant expansion tank 'A'  is installed continue to the next step.
  2. Inspect the coolant level in the coolant expansion tank. If the coolant is at the maximum level in the coolant expansion tank and the 'Coolant Level Low' message is displayed on the instrument panel cluster do not  continue with this bulletin. Repair as necessary with reference to TOPIx.
  3. NOTE: Any related repairs must be claimed as a separate warranty claim.

    Visually check the cooling system for signs of engine coolant leaks and distorted hoses. Make sure all the cooling system components are correctly installed.

    • If there are  any visual signs of engine coolant leaks do not  continue with this bulletin. Repair as necessary with reference to TOPIx.
    • If there are no  visual signs of engine coolant leaks continue to the next step.
    NOTE: The following procedure will enable the cooling system to be pressure tested for condition and leaks. Step 4 will check the expansion tank filler cap seal and the filler cap for leaks. Step  6 will check the entire cooling system.
  4. WARNING: Release the cooling system pressure by slowly turning the coolant expansion tank cap a quarter of a turn. Cover the expansion tank cap with a thick cloth to prevent the possibility of scalding. Failure to follow this instruction may result in personal injury.
    CAUTION: Be prepared to collect escaping coolant.
    G16999739

    Remove the coolant expansion tank filler cap.

  5. WARNING: Do not pressurize the coolant expansion tank filler cap to the maximum pressure shown on the filer cap.
    NOTE: Any related repairs must be claimed as a separate warranty claim.
    G16999740

    Using the correct adapter connect the cooling system pressure tester to the coolant expansion tank filler cap.

    • Slowly pressurize the coolant expansion tank filler cap 1.6 bar (23 psi) as shown on the gauge. No significant drop in pressure must be noted on the coolant expansion tank filler cap. If after 5 minutes the pressure significantly drops, the coolant expansion tank filler cap must be replaced.
    • If 1.6 bar (23 psi) is reached with no drop in pressure, validate the coolant expansion tank filler cap by increasing the pressure to between 1.7 bar (25 psi) to 2.1 bar (30 psi) to confirm the valve is operating as intended. The pressure must be released through the coolant expansion tank filler cap.
    • If the coolant expansion tank filler cap fails this test, the coolant expansion tank cap must be replaced. This must be completed under related repairs and must be claimed as a separate warranty claim.
  6. Depressurize and remove the coolant expansion filler tank cap from the cooling system pressure tester.
    • Disassemble the cooling system pressure tester.
  7. CAUTION: Do not exceed 2.0 bar (28 psi) when pressurizing the cooling system.
    NOTE: If the pressure continues to drop after the initial tolerance, the cooling system must to be checked for leaks.
    G16999741

    Using the correct adapter connect the cooling system pressure tester to the coolant expansion tank.

    • Slowly pressurize the cooling system until 2.0 bar (28 psi) is shown on the gauge.
    • No significant drop in pressure must be noted on the cooling pressure tester gauge. If after 5 minutes the pressure significantly drops, inspect the cooling system for leaks. A pressure drop of 0.15 bar (1psi) in the first minute is considered normal operation.
  8. G16999742

    Depressurize and remove the cooling system pressure tester.

  9. Install the coolant expansion 9. tank filler cap.
  10. NOTE: Any related repairs must be claimed as a separate warranty claim.

    Visually check the cooling system for signs of engine coolant leaks.

    • If there are  any visual signs of engine coolant leaks do not  continue with this bulletin. Repair as necessary with reference to TOPIx.
    • If there are no  visual signs of engine coolant leaks complete the SERVICE INSTRUCTION  section of this bulletin.

SERVICE INSTRUCTION

INGENIUM I6 3.0L Petrol, INGENIUM I6 3.0L Petrol PHEV Vehicles Only: 

  1. Remove the fuel supply line (see TOPIx Workshop Manual section 310-01: Fuel Tank and Lines - Removal and Installation - Fuel Supply Line).

    All Vehicles: 

  2. Renew the coolant expansion tank (see TOPIx Workshop Manual section 303-03: Engine Cooling - Removal and Installation - Coolant Expansion Tank).

    INGENIUM I6 3.0L Petrol, INGENIUM I6 3.0L Petrol PHEV Vehicles Only: 

  3. Install the new fuel supply line (see TOPIx Workshop Manual section 310-01: Fuel Tank and Lines - Removal and Installation - Fuel Supply Line).

    All Vehicles: 

  4. Check the coolant concentration (see TOPIx Workshop Manual section 303-03: Engine Cooling - General Procedure - Cooling System Concentration Check).