Pressure test coolant system to 1 bar overnight and start in morning this should force the coolant leak into the cylinders if it is leaking on cylinders 1 and 4 (there should be lots of white smoke and lumpy running if this is the case)also removing the exhaust manifold and looking into the cylinder head via the ehaust ports should reveal coolant around the valves or look at the turbo/manifold for signs of burnt coolant.
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