On-Vehicle Inspection

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

CHECK RADIATOR CAP SUB-ASSEMBLY

Measure the valve opening pressure.

If there are water stains or foreign matter on rubber packings 1, 2 or 3, clean the part(s) with water and finger scouring.
Check that rubber packings 1, 2 and 3 are not deformed, cracked or swollen.
Check that rubber packings 3 and 4 are not stuck together.

Fig 1: Locating Radiator Cap Rubber Packings
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Apply engine coolant to rubber packings 2 and 3 before using a radiator cap tester.
When using the cap tester, tilt it to 30° or more above the horizontal.

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

JUDGMENT CRITERIA SPECIFICATION

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)

Fig 2: Checking Radiator Cap

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