Cooling System: Inspection

To check the radiator for leakage, fill it with engine coolant, and attach the radiator cap tester (A) to the filler neck, and apply pressure. Check the following points:
Non-turbo model: 157 kPa (1.6 kg/cm ² , 23 psi)

Turbo model: 122 kPa (1.2 kg/cm ² , 18 psi)
- Each portion of radiator for leakage
- Hose joints and other connections for leakage
  NOTE:
  - For turbo model, be sure to install the tester to filler tank side.
  - Be particularly careful not to deform the filler neck of radiator when installing and removing the tester and after testing.
  - Non-turbo model
    
    Fig 1: Checking Radiator Cap - Non-Turbo Model
    Courtesy of SUBARU OF AMERICA, INC.
  - Turbo model
    
    Fig 2: Checking Radiator Cap - Turbo Model
    Courtesy of SUBARU OF AMERICA, INC.
- When performing this check, be sure to keep the engine stationary and fill radiator with coolant.
- Wipe off check points before applying pressure.
- Use care not to spill coolant when detaching tester from radiator.
- Do not remove the radiator side cap. (Turbo model)
Check the radiator cap valve open pressure using radiator cap tester.
NOTE: Rust or dirt on the cap may prevent valve from functioning normally: be sure to clean the cap before testing.

Raise the pressure until the needle of gauge stops and see if the pressure can be retained for five to six seconds. Replace the radiator cap if it is opened under a pressure less than the service limit value for this period.

Radiator cap valve open pressure

Non-turbo model

Standard: 93 - 123 kPa (0.95 - 1.25 kg/cm ² , 14-18 psi)

Service limit: 83 kPa (0.85 kg/cm ² , 12 psi)

Turbo model

Filler tank side

Standard: 93 - 123 kPa (0.95 - 1.25 kg/cm ² , 14-18 psi)

Service limit: 83 kPa (0.85 kg/cm ² , 12 psi)

Radiator side

Standard: 122 - 152 kPa (1.24 - 1.55 kg/cm ² , 18 -22 psi)

Service limit: 112 kPa (1.14 kg/cm ² , 16 psi)

Fig 3: Checking Radiator Cap Valve
Courtesy of SUBARU OF AMERICA, INC.
- 2.5 L model
  
  Fig 4: Sectional View Of Radiator Cap - 2.5 L Model
  Courtesy of SUBARU OF AMERICA, INC.
- 3.0 L model
  
  Fig 5: Sectional View Of Radiator Cap - 3.0 L Model
  Courtesy of SUBARU OF AMERICA, INC.
Start the engine, and then check it does not overheat or it is cooled excessively. If it overheats or it is cooled excessively, check the cooling system.
CAUTION: If the engine coolant is split over exhaust pipe, wipe it off with cloth to avoid emitting smoke or causing a fire.
- 2.5 L non-turbo model
  Refer to WATER PUMP . Refer to THERMOSTAT . Refer to RADIATOR . Refer to RADIATOR CAP .
- 2.5 L turbo model
  Refer to WATER PUMP . Refer to THERMOSTAT . Refer to RADIATOR . Refer to RADIATOR CAP .
- 3.0 L model
  Refer to WATER PUMP . Refer to THERMOSTAT . Refer to RADIATOR . Refer to RADIATOR CAP .
Check the radiator fan operates using Subaru Select Monitor, when the coolant temperature exceeds 96°C (205°F). If it does not operate, check the radiator fan system.
- 2.5 L non-turbo model
  Refer to INSPECTION , Radiator Fan System.
- 2.5 L turbo model
  Refer to INSPECTION , Radiator Fan System.
- 3.0 L model
  Refer to INSPECTION , Radiator Fan System.