Tacoma 2WD V6-4.0L (1GR-FE) (2006)
Radiator: Testing and Inspection
RADIATOR
ON-VEHICLE INSPECTION
1. INSPECT RADIATOR CAP SUB-ASSEMBLY
NOTICE:
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If the radiator cap is contaminated, rinse it with water.
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Before using a radiator cap tester, wet the relief valve and pressure valve with engine coolant or water.
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When performing the these steps (a) and (b), keep the tester at an angle of 30° or more above the horizontal.
a. Using a radiator cap tester, slowly pump and check that air comes from the vacuum valve.
Pumping speed: 1 push every 3 seconds or more
NOTICE: Push the pump at a constant speed. If air does not come from the vacuum valve, replace the radiator cap.
b. Pump the tester, then measure the relief valve opening pressure.
Pumping speed: 1 push every second
NOTICE: The above pumping speed is for the first pumping only (in order to close the vacuum valve). After the first pumping, the pumping
speed can be reduced.
HINT: Use the tester's maximum reading as the opening pressure.
Standard opening pressure: 93 to 123 kPa (0.95 to 1.25 kgf/cm2, 13.5 to 17.8 psi)
Minimum opening pressure: 78 kPa (0.8 kgf/cm2, 11.4 psi)
If the opening pressure is less than the minimum, replace the radiator cap.