Check Radiator Cap Subassembly

(a) Measure the valve opening pressure.

(1) If there are water stains or foreign matter on rubber packings 1, 2 or 3, clean the part(s) with water and finger scouring.

(2) Check that rubber packings 1, 2 and 3 are not deformed, cracked or swollen.

(3) Check that rubber packings 3 and 4 are not stuck together.

(4) Apply engine coolant to rubber packings 2 and 3 before using the radiator cap tester.

(5) When using the cap tester, tilt it to 30° or more above the horizontal.

(6) Pump the cap tester several times, and check the maximum pressure *1. Pumping speed: 1 pumps every second

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

Item

Specified Condition

Standard valve (for brand-new cap)

93.3 to 122.7 kPa (0.95 to 1.25 kgf/ cm2, 13.5 to 17.8 psi)

Minimum standard valve (after using cap)

78.5 kPa (0.8 kgf/cm2, 11.4 psi)

If the maximum pressure is less than the specified pressure for the minimum standard valve, replace the radiator cap sub-assembly.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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