2021 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE

Radiator Cap: Inspection

WARNING: This page is about a different variant/trim than selected.
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. Check that there is no deformation, cracks or other damages.
  3. Check the opening pressure of the radiator cap.
    1. Attach radiator cap tester.
      G13949319Courtesy of SUBARU OF AMERICA, INC.
    2. Increase pressure until the radiator cap tester gauge needle stops. Radiator cap is functioning properly if it holds the service limit pressure for 5 - 6 seconds. Replace the radiator cap if its valve opens at less than the service limit.
CAUTION: Be sure to remove foreign matter and rust from the cap in advance.
Otherwise, results of pressure test will be incorrect.

Specification: 

93 - 123 kPa (0.95 - 1.25 kg/cm2 , 14 - 18 psi)

Service limit: 

83 kPa (0.85 kg/cm2 , 12 psi)

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.