Check The Flexible Hoses

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.

Visually inspect the rubber portions of the flexible hoses for cracking. Probe the rubber section, including the ends of any insulators or protectors which may cover sections of the rubber hose, and near the ends where the rubber meets the metal collar.
NOTE: Be certain to move the probe slowly [approximately 25 mm (1 in) per second] when probing along any length of hose or tube.

Fig 1: Probing Along Length Of Hose Or Tube For Leaks