Question

q1: what must be done before replacing any air conditioning component?
refrigerant flush procedure
refrigerant filtering procedure
refrigerant replacement
refrigerant recovery

Explanation:

Before replacing any air - conditioning component, the refrigerant must be recovered to prevent it from being released into the atmosphere, which is harmful to the environment and also to avoid loss of refrigerant. Refrigerant flush, filtering, and replacement are steps that may be done after recovery in certain cases but not before component replacement.

Answer:

Refrigerant recovery