I have a 1.4 SRI Corsa 2011 with 70k miles. Recently head gasket went and replaced the engine with a new one under warranty. Leak in the system - replaced thermostat and spark plugs and coil pack also. Coolent is bubbling/boiling and keeps leaking. Last night it overheated and steam come from underneath the bonnet with all the coolent fluids in a puddle on the floor. Today I have filled with water/coolent and this is pouring directly out of something underneath the right hand side of the car. Any recommendations on what might need to be done? I have replaced the expansion tank cap also. I have spent so much money getting this repaired and still going wrong. Car has also been losing power from 2nd to 3rd gear, once im in 3rd to 4th it is absolutely fine with no lag. Wonder if someone could advise regarding the leak?