Radiator Cap: Inspection

WARNING: This page is about a different car, the 2003 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Attach the radiator cap to the tester.

Fig 1: Attaching Radiator Cap To Pressure Tester
Courtesy of SUBARU OF AMERICA, INC.
Increase pressure until the tester gauge pointer stops. Radiator cap is functioning properly if it holds the service limit pressure for five to six seconds.
1. Standard pressure: 93-123 kPa (0.95-1.25 kg/cm² , 14-18 psi)
2. Service limit pressure: 83 kPa (0.85 kg/cm²
NOTE: Be sure to remove foreign matter and rust from the cap in advance otherwise, results of pressure test will be incorrect.