Coolant: Testing and Inspection

ENGINE COOLANT

System Inspection


WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter turn to allow built-up pressure to escape. Carefully remove the cap by turning it all the way.

CHECKING COOLING SYSTEM HOSES

Check hoses for the following:
- Improper attachment
- Leaks
- Cracks
- Damage
- Loose connections
- Chafing
- Deterioration

CHECKING RESERVOIR LEVEL






- Check the reservoir tank coolant level when the engine is cool.
- Adjust coolant level, if necessary, to ensure that the coolant level is within the MIN to MAX range.

CHECKING COOLING SYSTEM FOR LEAKS






To check for leaks, apply pressure to the cooling system using suitable tools (A) and (B).
Testing pressure: Refer to "Radiator" Mechanical Specifications.

WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure coolant escaping from the radiator.

CAUTION:
Higher test pressure than specified may cause radiator damage.

CHECKING RADIATOR CAP

1.Inspect the radiator cap.
- Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
- Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the metal retainer.
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
Revision: March 20122013 Infiniti JX





2.Pull the negative-pressure valve to open it and check that it closes completely when released.
- Check that there is no dirt or damage on the valve seat of the radiator cap negative-pressure valve.
- Check that there are no abnormalities in the opening and closing conditions of the negative-pressure valve.





3.Check radiator cap relief pressure using suitable tool (A) and (B).





- Apply water or coolant to the cap seal surface before connecting the radiator cap to the tester,
- Replace the radiator cap if there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard values.

CHECKING RADIATOR

Check radiator for mud or clogging. If necessary, clean radiator as follows.

CAUTION:
- Be careful not to bend or damage the radiator fins.
- When radiator is cleaned on-vehicle, remove surrounding parts in order to access the radiator core.
Tape the harness and electrical connectors to prevent water from entering.
1.Spray water to the back side of the radiator core using a side to side motion from the top down.
2.Stop spraying when debris no longer flows from radiator core.
3.Blow air into the back side of radiator core using a side to side motion from the top down.
2
- Use compressed air lower than 490 kPa (5 kg/cm, 71 psi) and keep distance more than 30 cm (11.8 in).
4.Continue to blow air until no water sprays out.
5.Check for coolant leaks. Repair as necessary.