This tool kit is designed to detect leaks on the EGR cooler using two separate and different tests. The first test uses air pressure while the operator looks for air pressure decay on an air pressure gage to check for leaks in the exhaust side of the EGR Cooler system. The second test uses air pressure while the operator looks for leaks in the form of bubbles in a can of water to check for leaks in the coolant side of the EGR Cooler system.