Section 53 (Engine Cooling System (H4DOTC)): Radiator: Inspection

WARNING: This page is about a different car, the 2012 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Check that the radiator does not have deformation, cracks or damage.
Check that the hose has no cracks, damage or loose part.
Remove the radiator cap, fill the radiator with engine coolant, and then install the radiator cap tester to the filler neck of radiator.

Fig 1: Installing Radiator Cap Tester To Filler Neck Of Radiator
Courtesy of SUBARU OF AMERICA, INC.
Apply a pressure of 157 kPa (1.6 kg/cm² , 23 psi) to the radiator and check the following points:

Leakage from the radiator or its vicinity
Leakage from the hose or its connections

CAUTION:

Engine should be turned off.
Wipe engine coolant from check points in advance.
Be careful of the spurt of engine coolant when removing the radiator cap tester.
Be careful not to deform the filler neck of radiator when installing and removing the radiator cap tester.