Radiator Cap Testing
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the radiator cap, wet its seal with engine coolant, and then install it on a pressure tester.
 Courtesy of HYUNDAI MOTOR AMERICA
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- Apply a pressure of 93.16-122.58kpa (0.95-1.25kg/cm2
, 13.51-17.78psi).
- Check for a drop in pressure.
- If the pressure drops, replace the cap.