I responded to a service call for no cooling on a residential AC system. After a short diagnosis with my Testo Smart Probes, it was clear that a lack of refrigerant was present. After a refrigerant leak check with the Testo 316-3, a very polarizing solution was implemented.
Check out my article on the process that should be followed before using a leak sealant.
https://www.hvacknowitall.com/blogs/blog/799583-hvac-r-internal-sealants—a-different-approach#.YstUBHbMJPY
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