Cookie2188 makes a good point, but you can rent a test kit from Autozone ($25.00 to rent the tester- you get it back upon return) that tests for combustion/emission gases in your coolant (it's called a Block Tester). You have to purchase the fluid for $8.99- it takes a small amount of test fluid to perform the test and the test fluid you purchase will allow you to perform multiple tests. Run your engine until it is on the high side of operating range and put the tester cone in place of your radiator (or recovery tank) cap. Put the aspirator (bulb) on top and squeeze slowly for two minutes. This pulls air from the coolant into the test fluid. If there are combustion/emissions gases present, the fluid will turn green or yellow (each brand will turn a different color but always green or yellow). If it turns a bluish green you've got some leakage of combustion gases in your cooling system and probably have a bad head gasket, but if it turns green or yellow you definately have a bad head gasket if not a cracked cylinder head or engine block. To narrow this down, unplug the spark plug wires for one head and redo the test- repeat by plugging in the first side and unplugging the next. This will tell you which head/gasket is the culprit.
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there is a tool that u can buy in sear 120 dollars and its a pump tu pressurise the coolant system. that tool should tell u were your leak is. if u dont find anything check for white smoke from the exhaust and engine oil for water.
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