Remove the radiator cap, wet its seal with engine coolant, and then install it to a pressure tester.

Apply a pressure of 93.2 ~ 122.6 kPa (0.95 ~ 1.25 kg/cm², 13.51 ~ 17.78 psi).

Check for a drop in pressure.

If the pressure drops, replace the cap.

Wait until engine is cool, then carefully remove the radiator cap.

Fill the radiator with engine coolant, then install the pressure tester on the filler neck.

Inspect for engine coolant leaks and a drop in pressure.

In case of coolant leakage or pressure drop, replace the part.