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Did you check your car for a coolant leak anywhere? Is your radiator cap have a good seal?
If you have no known leaks and have a pressurized system, it is most likely your headgasket.
To tell if its your headgasket or not you will have to "pressurize" your coolant system. Which means you will have to drive around for awhile. Then pop your hood, if the HG is blown you should have a lot of coolant in your overflow bottle and/or it will be bubbling.
CRAIG
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