When my dads Civic headgasket blew the #3 cylinder was compressing the coolant system. No coolant was getting into the oil. If you look at a headgasket the coolant system is around the cylinder walls, its closer than the oil passages.
Also when the coolant system was being compressed in my dads Civic it blew a few rad hoses.
I say replace thermostat. that's what it sounds like. But when you buy it buy the better one they have. It will probably be like 25 cents more and your getting a better part.
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