Check the color of fluid in the combustion gas leak tester.
A yellow or green color will indicate a combustion leak. A blue color will indicate there is no leak. This information
will help isolate the source of air in the cooling system, if any.
NOTE: The test kit is not sensitive enough to detect very small combustion gas leaks. Do not rule out combustion
gas leaks, even if the combustion gas leak test does not indicate a combustion gas leak.
