On-Vehicle Inspection

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CHECK RADIATOR RESERVOIR CAP SUB-ASSEMBLY

Measure the valve opening pressure.

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

Fig 1: Checking Radiator Reservoir Cap Sub-Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check that O-ring 1 is not deformed, cracked or swollen.
Apply engine coolant to O-ring 1 and rubber packing 2 before using a radiator cap tester.
When using the cap tester, tilt it more than 30°.

Pump the 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.

Fig 2: Checking Radiator Cap Maximum Pressure

Judgment criterion

ITEM SPECIFIED CONDITION CHART

Item	Specified Condition
Standard value (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 value (after using cap)	78.5 kPa (0.8 kgf/cm² , 11.4 psi)

If the maximum pressure is less than the minimum standard value, replace the radiator reservoir cap sub-assembly.