Expert quality block or combustion leak tester for determining if coandsup2 is present coandsup2 in the cooling system can indicate a head gasket leak cracked block or a warped head etc simple to operate by adding blue detector fluid to the tester and placing tester onto the radiator can be used in conjunction with a cone adaptor or an adaptor within the draper radiator pressure te 14455 and 23420 expert quality block or combustion leak tester for determining if co is present in a vehicl