Last week I found a 1998 Jeep in sitting in my bay with an overheating problem. After several tests I began to suspect a head-gasket issue or cracked head. Now, in the shop we had a debate about the use of the magic blue fluid in a bottle to be the 100% final decision whether or not the head and head gasket is okay or not. So, my question to all of you is, what are your thoughts about blue block testing fluid as a valid test? Is it something you use and depend on? Or do you prefer other methods?

James Elleby
Technician
Broadway Automotive
Albert Lea, Minnesota, USA