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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Cooling System (2.0L)) >> General Description >> Specification
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Section 12 (Engine Cooling System (2.0L)): General Description: Specification

WARNING: This page is about a different variant/trim than selected.
Cooling system Electric fan + Forced engine coolant circulation system
Total engine coolant capacity L (US qt, Imp qt) CVT model: Approx. 8.3 (8.8, 7.3)
MT model: Approx. 8.1 (8.6, 7.2)
Water pump Type Centrifugal impeller type
Discharge performance Discharge rate L (US gal, Imp gal)/min 248 (65.5, 54.6)
Pump speed - Discharge pressure 8, 580 r/min - 88 kPa (8.9 mAq)
Engine coolant temperature 80°C (176°F)
Impeller diameter mm (in) 56 (2.2)
Number of impeller vanes 7
Pump pulley diameter mm (in) 100 (3.9)
Thermostat Type Wax pellet type
Starting temperature to open 86 - 90°C (187 - 194°F)
Fully opens 95°C (203°F)
Valve lift mm (in) 8.0 (0.315) or more
Valve opening size mm (in) 32 (1.26)
Radiator fan Motor input Main fan W 120
Sub fan W 120
Fan diameter/Blade Main fan 320 mm (12.6 in)/9
Sub fan 320 mm (12.6 in)/11
Radiator Type Down flow, pressure type
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 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 to -4.9 or less (-0.01 --0.05, -0.1 --0.7)
Fins Corrugated fin type
Reservoir tank Capacity L (US qt, Imp qt) 0.45 (0.48, 0.40)
  Recommended materials Item number Alternative
Engine 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 -