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Easiest way is to cap the inlet and outlet and submerse in hot water. The hot water will cause an internal pressure increase which will show bubbles. This method has used in the aircraft industry for verifying that components are sealed from water intrusion.

DABTL, How involved in the repair do you want to get? You could remove each injector and look for evidence of antifreeze. While the injector is removed, pressurize the cooling system and listen for a hissing sound in the cylinder with the injector removed. If the hiss is detected, the...