if you have trapped air in your system it would suck fluid from the overflow, the only way its going to shoot fluid out is if something is expelling out of the engine into the cooling system, or if the coolant gets hot enough to boil. Sounds like exhaust gasses in the cooling system. It could be anything from a defective gasket to a mistake by the installer. Get a block tester kit from napa and check for combustion gasses in the cooling system.
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