Engine Cooling: Diagnosis Land Rover Freelander L359

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage. VISUAL INSPECTION Mechanical Electrical Coolant leaks Coolant expansion tank Electric fan Radiator Fuse Wiring harness Loose or corroded connector(s) Engine Coolant Temperature (ECT) sensor
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

SYMPTOM CHART

DTC INDEX

Note. If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures information or determine if any prior approval program is in operation, prior to the installation of a new module/component.

Note. Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the scan tool to the first five digits of the seven digit code listed to identify the fault (the last two digits give extra information read by the manufacturer approved diagnostic system).

Note. When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal places, and with a current calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.

Note. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Note. If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

PINPOINT TEST A: LOSS OF COOLANT

PINPOINT TEST B: THE ENGINE OVERHEATS

PINPOINT TEST C: THE ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE

COOLING SYSTEM PRESSURE TEST

1. Switch the engine off.
2. Open the hood and install protective fender covers.
3. Carefully remove the coolant expansion tank pressure cap from the coolant expansion tank to relieve pressure in the cooling system. Add coolant to coolant expansion tank as necessary.
4. Install the pressure tester equipment to the cooling system following manufacturers instructions. Reinstall the coolant expansion tank pressure cap (if pressure test equipment is not installed to the coolant expansion tank).
5. Pressurize the cooling system to the coolant expansion tank pressure cap lower limit.
6. Observe the gauge reading for approximately two minutes. Pressure should not drop during this time. If system holds pressure, continue from step 8. If the pressure drops, check the complete cooling system for leaks. Also refer to engine system checks if a leak cannot be located in the cooling system. Correct any leaks found and recheck the system.
7. Release the system pressure and remove the pressure test equipment. Check the coolant level. Replenish as necessary with the correct coolant solution. See «SPECIFICATIONS»(ref-531918-S19268179392013022000000) .
8. Check the radiator overflow hose for any obstructions which may block the flow of coolant either to or from the coolant expansion tank.
9. Conduct the coolant expansion tank pressure cap pressure test.

COOLANT EXPANSION TANK PRESSURE CAP PRESSURE TEST

1. Remove the expansion tank pressure cap from the coolant expansion tank.
2. Use water to clean cap in area of rubber seal and vacuum relief valve. Following manufacturers instructions, install the coolant expansion tank pressure cap to the pressure tester.
3. Slowly pressurise the system until the pressure gauge reading stops increasing, and note highest pressure reading obtained.
4. Release pressure and repeat Step 3 at least twice to make sure the pressure test reading is repeatable and within specification.
5. If the pressure test gauge readings are not within specification, install a new coolant expansion tank pressure cap.

THERMOSTAT TEST

Remove the thermostat See THERMOSTAT . Inspect for visible damage, note its opening temperature and immerse it in water. Heat the water until this temperature is reached. The thermostat should begin to open. If it does not begin to open, install a new thermostat. and See THERMOSTAT . If thermostat begins to open, continue to heat the water until the thermostat fully opens, 5.8 mm (0.2 in) or more off the seat. If it does not fully open, install a new thermostat. and See THERMOSTAT .

RADIATOR LEAK TEST - REMOVED FROM THE VEHICLE

Clean the radiator before leak testing to prevent contamination of the test tank. Leak test the radiator in clean water with 138 kPa (20 psi) air pressure.