INSPECT RADIATOR CAP SUB-ASSEMBLY
Note
If the radiator cap is contaminated, always rinse it with water.
Before using a radiator cap tester, wet the relief valve and pressure valve with engine coolant or water.
When performing steps (a) and (b) below, keep the tester at an angle of over 30° above the horizontal.
Using a radiator cap tester, slowly pump the tester and check that air is coming from the vacuum valve.
| Pump speed |
|---|
| 1 push every 3 seconds or more |
Note
Push the pump at a constant speed.
Tech Tips
If air is not coming from the vacuum valve, replace the radiator cap.
Pump the tester and measure the relief valve opening pressure.
| Pump speed |
|---|
| 1 push within 1 second |
Note
The pump speed above should be followed for the first pump only. After the vacuum valve is closed, the pump speed can be reduced.
| Standard opening pressure |
|---|
| 93.3 to 122.7 kPa (0.95 to 1.25 kgf*cm2, 13.5 to 17.8 psi) |
| Minimum opening pressure |
|---|
| 78.5 kPa (0.8 kgf*cm2, 11.1 psi) |
Tech Tips
Pay attention to the tester's maximum reading of the opening pressure. If the maximum reading is less than the minimum opening pressure above, replace the radiator cap.