Section 12 (Engine Cooling System (WRX-STI)): General Description: Specification
WARNING: This page is about a different car, the 2013 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
| Cooling system | Electric fan + Forced engine coolant circulation system | |||||
| Total engine coolant capacity | L (US qt, Imp qt) | Approx. 7.7 (8.1, 6.8) | ||||
| Water pump | Type | Centrifugal impeller type | ||||
| Discharge performance | Discharge rate | L (US gal, Imp gal)/min. | 200 (52.8, 44.0) | |||
| Pump speed - Discharge pressure | 6, 000 rpm - 225.4 kPa (23.0 mAq) | |||||
| Engine coolant temperature | 80°C (176°F) | |||||
| Impeller diameter | mm (in) | 76 (2.99) | ||||
| Number of impeller vanes | 8 | |||||
| Pump pulley diameter | mm (in) | 60 (2.36) | ||||
| Clearance between impeller and pump case | mm (in) | Standard | 0.5 - 1.5 (0.020 - 0.059) | |||
| Thermostat | Type | Wax pellet type | ||||
| Starting temperature to open | 76 - 80°C (169 - 176°F) | |||||
| Fully opens | 91°C (196°F) | |||||
| Valve lift | mm (in) | 9.0 (0.354) or more | ||||
| Valve bore | mm (in) | 35 (1.38) | ||||
| Radiator fan | Motor input | Main fan | W | 120 | ||
| Sub fan | W | 120 | ||||
| Fan diameter / Blade | Main fan | 318.5 mm (12.54 in)/9 | ||||
| Sub fan | 318.5 mm (12.54 in)/11 | |||||
| Radiator | Type | Down flow | ||||
| Core dimensions | Width x Height x Thickness | mm (in) | 687.4 x 340 x 16 (27.06 x 13.39 x 0.63) |
|||
| Pressure range in which cap valve is open | Coolant filler tank side | kPa (kg/cm2 , psi) | Positive pressure side | Standard | 93 - 123 (0.95 - 1.25, 14 - 18) | |
| Limit | 83 (0.85, 12) | |||||
| Negative pressure side | Standard | -1.0 - -4.9 (-0.01 - -0.05, -0.1 - -0.7) |
||||
| Radiator side | kPa (kg/cm2 , psi) | Positive pressure side only | Standard | 122 - 152 (1.24 - 1.55, 18 - 22) | ||
| Limit | 112 (1.14, 16) | |||||
| Fins | Corrugated fin type | |||||
| Reservoir tank | Capacity | L (US qt, Imp qt) | 0.45 (0.48, 0.40) | |||
| Recommended materials | Item number | Alternative | |
|---|---|---|---|
| Coolant | SUBARU SUPER COOLANT (Concentrated type) | - | - |
| SUBARU SUPER COOLANT (Diluted type) | K0670Y0001 | ||
| Water for dilution | Distilled water | - | Soft water or tap water |
| Cooling system protective agent | Cooling system conditioner | SOA345001 | - |