Engine Cooling System: Overview Subaru BRZ ZC

On-Vehicle Inspection

Scheme 1

Scheme 2

1. Coolant (SUBARU Super Coolant) level check When the engine is cold, make sure that the reservoir tank level is between the FULL line and LOW line. NOTE: If the fluid level is low, check for coolant leakage and refill the coolant to the FULL line. CAUTION: Do not use water instead of the coolant. Remove the radiator cap and make sure that the coolant is filled up to the radiator filler neck.
2. Coolant (SUBARU Super Coolant) check Remove the radiator cap. WARNING: To avoid the risk of burn, do not remove the radiator cap when the engine and radiator are hot. The fluid and steam may blow out due to the pressure. Check that there is no excessive rust or scale deposition around the radiator cap and water inlet. NOTE: If it is excessively dirty, replace the coolant. (Refer to «REPLACEMENT»(ref-619192-S38018017162014053000000) ) Install the radiator cap.
3. Coolant (SUBARU Super Coolant) leakage check WARNING: To avoid the risk of burn, do not remove the radiator cap when the engine and radiator are hot. The fluid and steam may blow out due to the pressure. Attach the radiator cap tester to the radiator. NOTE: If the engine coolant level is low, refill the coolant of the specified concentration from the radiator filler neck. Warm up the engine. Perform the pumping operation up to a pressure of 137 kPa {1.4 kgf/cm 2 , 20 psi} and make sure that the pressure does not decrease. NOTE: If the pressure decreases, check the hoses, radiator and water pump for leakage. If there is no leakage to the outside, check the heater core, cylinder block and cylinder head.

Scheme 3

Scheme 4

1. INSPECT COOLING FAN OPERATION AT LOW TEMPERATURES (Below 92 °C (198 °F)) Turn the ignition switch to ON. Check that the cooling fans stop. If it does not, check the cooling fan relays and engine coolant temperature sensor, and check whether there is a disconnection or an open circuit between them. Disconnect the engine coolant temperature sensor connector. Check that the cooling fans operate. If it does not, check the fuses, cooling fan relays, ECM and cooling fans, and check for a short circuit between the cooling fan relays and the engine coolant temperature sensor. Reconnect the engine coolant temperature sensor connector.
2. INSPECT COOLING FAN OPERATION AT HIGH TEMPERATURES (Above 95 °C (203 °F)) Start the engine, and raise the engine coolant temperature to above 95 °C (203 °F). NOTE: The engine coolant temperature is detected by the engine coolant temperature sensor on the water outlet. Check that the cooling fans operate. If it does not, replace the engine coolant temperature sensor.

See also:
• V-BELT (FA20)