• Check the radiator cap valve opening pressure using a radiator cap tester to ensure the cap is within specification (refer to the applicable Subaru service manual).
Note: If the cap is out of specification, replace it.
2. Coolant Reservoir Tank Cleaning:
• Remove the reservoir tank (refer to the applicable Subaru service manual).
• Using clean water, thoroughly clean the inside of the reservoir tank.
• Reinstall the reservoir tank. Fill with coolant to the Full mark.
Note: Be sure to use Genuine Subaru Super Coolant or Subaru Long Life Coolant, depending upon what type of coolant is currently in the system.
3. Coolant Reservoir Tank Hose Modification:
• Remove the hose from the reservoir tank. Cut 20 mm from the bottom of the hose at a 45° angle. Reinstall the hose in reservoir tank. See Fig. 3.
• Start the engine and allow it to fully warm up.
• Turn off the engine and allow it to fully cool down.
• Re-check coolant level in the reservoir and add coolant, if needed.
Note: Be sure to use Genuine Subaru Super Coolant or Subaru Long Life Coolant, depending upon what type of coolant is currently in the system.
Courtesy of ALLDATA.