If the engine is still able to run
You need to lower the coolant level and combustion check the coolant system with a block test kit
By What your saying that it blowing coolant out
This very well could be a head gasket issue
Being that the head gasket is comprised and as the piston comes up to compress for combustion
This pressure could be forced on the coolant jacket side of the block forcing your coolant to be blown out
This pressure has to go somewhere
