Trouble Symptom:

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.

Radiator sub fan does not rotate under conditions (1) and (2) above.

Fig 1: Radiator Sub Fan Switch Inspection (Non-Turbo Model) (1 Of 3)

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Radiator Sub Fan Switch Inspection (Non-Turbo Model) (2 Of 3)

Courtesy of SUBARU OF AMERICA, INC.

Fig 3: Radiator Sub Fan Switch Inspection (Non-Turbo Model) (3 Of 3)

Courtesy of SUBARU OF AMERICA, INC.

NOTE: Inspection by SOA (distributor) service is required, because probable cause is deterioration of multiple parts.