![]() 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).Using clean water and a brush, thoroughly clean the valve (inner and outer surface) and the valve seal surface.Manually open the negative pressure valve.Note: A used toothbrush that has been cleaned works great. Using clean water and a brush, thoroughly clean the cap seal surface.Note: If replacing the cap, skip to Step 2. If it was empty when the system is hot it can draw air into the cooling system. You are right it is there for overflow but it needs to have some coolant into it because it draws it back into the cooling system when it cools down due to heat expansion and cooling contraction. If there is an excessive amount of debris or the sealing rubber on the cap appears to be pitted or damaged, replace the cap. It should be between the low and high line. However I think they misread the service interval as, 2015 Subaru maintenance schedule and new car break-in period says that Engine coolant: Subaru Super Coolant long life coolant. Another shop said that recommended maintenance is to flush the coolant at 75k. If this is not done completely, remaining debris may result in a repeat issue. I have a '15 and my mechanic inspected the coolant at 60k. Crosstrek Coolant Type Forester On the Subaru Forester page you can find the coolant type you need for that particular car. Ascent Coolant Type Crosstrek On the Subaru Crosstrek page you can find the coolant type you need for that particular car. The important part is the thorough cleaning of the negative pressure valve. Ascent On the Subaru Ascent page you can find the coolant type you need for that particular car. Radiator Cap Cleaning: Many caps can be successfully cleaned. The shorter coolant reservoir tank hose was used in production as shown in Chart 1.ฤก. In order to correct the condition you need to clean (and test) or replace the radiator cap, clean out the reservoir tank, and slightly shorten the hose, following the below repair procedure. ![]() If this condition continues over time, there will not be enough coolant in the system to maintain proper engine temperature. This causes the radiator cap not to seal, allowing excessive amount of coolant to escape overflowing the reservoir tank. ![]() Notes: engine coolant - starting with the 2008 Impreza STI and all 2009. If there is debris that settles to the bottom of the reservoir tank, the hose is low enough to also suck debris back into radiator. The 2015 Subaru Forester has 10 NHTSA complaints for the wheels at 54,332 miles. ![]()
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