Lexus NX: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT RESERVOIR CAP

(a) Measure the valve opening pressure.

*a

O-Ring

*b

Rubber Packing

(1) If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.

(2) Check that the O-ring is not deformed, cracked or swollen.

(3) Apply engine coolant to the O-ring and rubber packing before using a radiator cap tester.

(4) When using the radiator cap tester, tilt it more than 30° degrees.

*1

Reservoir Cap

*a

Radiator Cap Tester

*b

30° or more

(5) Pump the radiator cap tester several times and check the maximum pressure*.

Pump speed:

1 pump per second

*: Even if the cap cannot maintain the maximum pressure, it is not a defect.

Standard Judgment Criterion:

Item

Specified Condition

Standard value

(for brand-new cap)

93 to 123 kPa (1.0 to 1.3 kgf/cm2, 13.5 to 18 psi)

Minimum standard value

(for used cap)

79 kPa (0.8 kgf/cm2, 11.4 psi)

If the maximum pressure is less than the minimum standard value, replace the reservoir cap.

2. INSPECT FINS FOR BLOCKAGE

(a) If the fins are clogged, wash them with water or a steam cleaner and dry them with compressed air.

NOTICE:

  • To avoid damaging the fins, the injection direction should be at right angles to the core surface.
  • If the steam cleaner is too close to the core, there is a possibility of damaging the fins, so maintain the following injection distances.

    Standard Injection Distance:

    Injection Pressure

    Specified Condition

    2942 to 4903 kPa (30.0 to 50.0 kgf/cm2, 427 to 711 psi)

    300 mm (11.8 in.)

    4903 to 7845 kPa (50.0 to 80.0 kgf/cm2, 711 to 1138 psi)

    500 mm (19.7 in.)

  • If the fins are bent, straighten them with a screwdriver or pliers.
  • Do not expose electronic components to water.

(b) Dry the fins with compressed air.

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