System Discharge
WARNING: This page is about a different car, the 2001 Subaru Forester and 2000 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Slowly, discharge the system starting with the high-pressure side until the pressure drops below 345 kPa (3.52 kg/cm2 , 50 psi), then open the low-pressure side.