Hi guys, i have a problem again.. When my engine idling, i see bubbles popping up inside my raditor tank after i open my radiator cap. I even encounter loss of 1/4 coolant inside my spare tank. Is this the sign of gasket blown? I had changed done my head gasket, radiator fan, themostat, radiator cap, flush my radiator a few times n even timing belt n water pump just few months back. Its even less than 10,000km of driving. Is there any other causes of this? I'm driving a Civic ek4 SiR.