Yeah, I ve lifted the front, squeeze top and bottom hoses. Reved he engine to 5K. And it works for a while but within a week, the bubbles come back. I dont have any leaks, all the hoses are new and the system has been pressure tested and all is OK.

No really a big deal though. This is a fairly common issue with RS Liberty's anyway. I dont know of any RS Lib owner that has completely gotten rid of the problem permanently

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RS Liberty - Because WRX's are only good for parts...