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 main fan does not rotate under the above conditions.
Radiator main fan does not rotate at high speed when the following conditions are both met:

Engine coolant temperature is above 90°C (194°F)
A/C is ON

Fig 1: Radiator Main Fan Does Not Rotate Inspection (Turbo Model) (1 Of 5)

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Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Radiator Main Fan Does Not Rotate Inspection (Turbo Model) (2 Of 5)

G02621347

Courtesy of SUBARU OF AMERICA, INC.

Fig 3: Radiator Main Fan Does Not Rotate Inspection (Turbo Model) (3 Of 5)

G02621348

Courtesy of SUBARU OF AMERICA, INC.

Fig 4: Radiator Main Fan Does Not Rotate Inspection (Turbo Model) (4 Of 5)

G02621349

Courtesy of SUBARU OF AMERICA, INC.

Fig 5: Radiator Main Fan Does Not Rotate Inspection (Turbo Model) (5 Of 5)

G02621350

Courtesy of SUBARU OF AMERICA, INC.

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