Let us start by defining what a refrigerant is. A refrigerant is a substance that in many cases is a fluid that is used to cool a space in the refrigeration cycle. The main purpose of refrigerants is to absorb heat and then use phase change thermodynamic phenomena to release it into another space. In other words, the fluid will change into a gas when it absorbs the heat and turn back into a fluid once it has released it.
Before you are able to troubleshoot your Goodman Central Air Conditioner you need to have a basic understanding of how air conditioners work. This mostly involves the various components of an air conditioner as well as the sequence of operation.