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 the above conditions.
Radiator sub fan does not rotate at high speed when the following conditions are both met:
1. Engine coolant temperature is above 90°C (194°F)
2. A/C is ON

Fig 1: Radiator Sub Fan Switch Inspection (Turbo Model) (1 Of 5)

G02621356

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Radiator Sub Fan Switch Inspection (Turbo Model) (2 Of 5)

G02621357

Courtesy of SUBARU OF AMERICA, INC.

Fig 3: Radiator Sub Fan Switch Inspection (Turbo Model) (3 Of 5)

G02621358

Courtesy of SUBARU OF AMERICA, INC.

Fig 4: Radiator Sub Fan Switch Inspection (Turbo Model) (4 Of 5)

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Courtesy of SUBARU OF AMERICA, INC.

Fig 5: Radiator Sub Fan Switch Inspection (Turbo Model) (5 Of 5)

G02621360

Courtesy of SUBARU OF AMERICA, INC.

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