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You need to do a cylinder leakage test.
It sounds like you may have a head gasket not sealing properly, and this is where your water loss is going and is causing the engine to run rough also.
A quick test is to remove the radiator cap when the engine is cool, then run the engine till it gets hot and when the water is hot you should start to see the water running along in the radiator. Make sure it is full and make sure no bubbling and squirting of water from the radiator happens.
If this happens then it is a good sign that your head gasket needs replacing.
Let me know if you want more information.
It may be overfilled. Do you keep adding coolant when it blows it out? The reservoir has a line to which the coolant should be filled. If overfilled it will blow out when hot. Other reasons may be that the fan that cools the radiator may not be cycling on and off to keep it cool. Also check the small belt on the right front side of the engine that is under a plastic cover that runs the water pump. It sometimes breaks and the water pump stops turning.
Its possible your thermostat is stuck in either the on or off position. Also its not an expensive part. I would start there first and go from there. Also how many miles are on the vehicle. Also I assume this is a north star engine. Thanks, Lee
Check for coolant in the oil. The oil will look like chocolate milk. After it's sat overnight you can also try loosening your oil drain plug until fluid comes out. See if it looks like chocolate milk or is just straight coolant. Check your spark plugs. Pull them out of the cylinder head and check for white corrosion or actual coolant in chambers or threads. You can also do a block test (rent the block tester at Autozone for $25.00- return when you're done and you get the $25.00 back) the block test fluid is $8.99. Follow the directions and if your test fluid turns green or yellow you have combustion/emission gases in the coolant. This can be caused by a cracked block/ cylinder head/ blown head gasket. You can also disconnect one head's spark plugs and test that cylinder then the other to see if only one is causing the problem. Hope this helps. If you're losing coolant, it's probably not your water pump. A lot of times if a head gasket fails, the head (usually made from Aluminum) will crack or warp.
If you are not loosing coolant on the ground. You may have a problem of a bad intake manifold gasket or worst a bad head gasket. The two things to look at are coolant in your oil, manifold gasket. Coolant out the exhaust, head gasket.