June 6, 201411 yr 2003 Outback H6 When I remove the radiator cap, a quick split second burst of coolant spits out of the overflow tank where the rubber hose goes into it. The radiator is a few cups low and the overflow tank is overfull. So coolant is getting pushed into the overflow but not sucked back in the radiator. New Subaru radiator cap. No other symptoms. Headgasket? Guess i'll test for exhaust gases in the coolant, a compression and leakdown test is out of the question with those annoying spark plugs.
June 6, 201411 yr My SOHC 2.5 did that when the head gaskets were bad. Exhaust gas was pressurizing the coolant.
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