One of four major components that make up the evaporator/blower, the expansion valve is attached to the inlet [HP] of the evaporator coil, and controls the flow of refrigerant into the evaporator. For the valve to operate correctly, a chain of events must take place allowing refrigerant to move through the small orifice within, and onto the evaporator coil. This Youtube video explains the process in great detail.
Internal Components of the Evaporator Blower
Found on the Inlet of the Evaporator
Over time, the build-up of debris can block the pathway of refrigerant through the small orifice, which in turn prevents the evaporator from being effective in cooling the air. Rather than replacing the evaporator/blower unit, a cheaper solution would be to inspect all of the inner working components, making the necessary changes where required. Applicable for all models.
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