Checking Radiator Cap

WARNING: This page is about a different variant/trim than selected.

Check valve seat of radiator cap.
- Check if valve seat is swollen to the extent that the edge of the plunger cannot be seen when watching it vertically from the top.
- Check if valve seat has no soil and damage.
  
  Fig 1: Identifying Radiator Cap
Pull negative-pressure valve to open it, and make sure that it is completely closed when released.
- Make sure that there is no dirt or damage on the valve seat of radiator cap negative-pressure valve.
- Make sure that the valve operates properly in the opening and closing conditions.
  
  Fig 2: Checking Valve Seat Of Radiator Cap
Check radiator cap relief pressure using Tool.
Tool number : EG17650301 (J-33984-A)

Standard: 78 - 98 kPa (0.78 - 0.98 bar, 0.8 - 1.0 kg/cm ² , 11 - 14 psi)

Limit: 59 kPa (0.59 bar, 0.6 kg/cm ² , 9 psi)

Fig 3: Checking Radiator Cap Relief Pressure
- When connecting the radiator cap to the tester, apply water or coolant to the cap seal surface.
- Replace the radiator cap if there is an abnormality in the negative - pressure valve, or if the open-valve pressure is outside of the standard values.
Replace radiator cap if there it does not comply to specifications to the above three checks.
CAUTION: When installing radiator cap, thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.