Radiator Leakage Test

WARNING: This page is about a different car, the 2011 Hyundai Tucson. However, it is still accessible from the selected car via links, so may be relevant.

Wait until engine is cool, then carefully remove the radiator cap and fill the radiator with engine coolant, then install a pressure tester on it.

Fig 1: Removing Radiator Cap
Courtesy of HYUNDAI MOTOR CO.
Apply a pressure of 93 ~ 123kPa (0.95 ~ 1.25kgf/cm² , 14 ~ 19 psi).
Inspect for engine coolant leaks and a drop in pressure.
If the pressure drops, check hoses, the radiator and the water pump for leakage. If there is no leakage, inspect the heater core, the cylinder block and the cylinder head.
Remove the tester and reinstall the radiator cap.
NOTE: Check for engine oil in coolant and/or coolant in engine oil.