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Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Engine Cooling System) >> Engine Coolant >> Inspection >> Engine Coolant Leakage Check

Engine Coolant Leakage Check

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Stop the engine. 
  • The engine coolant is pressurized when it is hot. Wait until engine coolant cools down before proceeding the work. 
  • If the engine coolant is spilt over the engine, exhaust pipe or the under cover, completely wipe it off to avoid emission of smoke or causing a fire. 
  1. Remove the radiator cap.
  2. Fill the radiator with engine coolant, and then install the radiator cap tester to the filler neck of radiator.
    CAUTION:

    Be careful not to deform the filler neck of radiator when installing and removing the radiator cap tester. 

    G14601322Courtesy of SUBARU OF AMERICA, INC.
  3. Apply a pressure of 157 kPa (1.6 kg/cm2 , 23 psi) to the radiator and check the following points:
    • Leakage from the flow path of the engine coolant or its vicinity
    • Leakage from the hose or its connections
    • Significant pressure drop
    CAUTION:

    Be careful of engine coolant from spurting out when removing the radiator cap tester. 

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