Radiator Cap Testing
WARNING: This page is about a different car, the 2025 Kia Soul. 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, then install it on a pressure tester.
 Courtesy of KIA MOTORS AMERICA, INC.
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- Apply a pressure of 79.4 - 122.58 kPa (0.95 - 1.25 kgf/cm2
, 11.5 - 17.78 psi).
- Check for a drop in pressure.
- If the pressure drops, replace the cap.