CO2 Leak tester for engines – diagnose head gasket and cylinder head problems. With this CO2 leak tester for engines, you can easily detect leaking combustion gases (carbon dioxide) that enter the cooling system when a head gasket fails or a cylinder block cracks. This tester is essential for the quick and accurate detection of engine problems in both petrol and diesel engines. The CO2 test kit checks for: Blown or leaking head gaskets Cracked cylinder heads Blockages in the cooling system Other internal engine leaks The kit comes complete with a cone adapter and test fluid, ready for immediate use. During testing, mount the tester on the coolant filler neck of the running engine. Using the rubber bulb, draw the gases that collect at the top of the filler neck through the test fluid. If the fluid changes color from blue to green, it indicates the presence of CO2, a clear sign of a blown head gasket, cracked cylinder head, or another serious engine leak. Provides fast and accurate engine diagnosis and prevents costly engine damage.