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RECEIVER/DRIER
The receiver/drier functions as the filter for the A/C system, removing contaminants and moisture from the refrigerant. Receiver/driers are always found on A/C systems which have an expansion valve and are located on the high side of the system, usually between the condenser and the internal expansion valve.

The receiver/drier consists of a cylindrical tank (which looks similar to a black metal can), and inside is a solid core filter which contains a drying agent (desiccant) and provides several important functions for the system:

The receiver/drier acts as storage tank. It receives the high pressure (hot) liquid refrigerant from the condenser and holds this liquid until the evaporator requires it. These requirements will vary according to operation conditions.
The solid core filter acts as a filter to capture dirt, rust, or any foreign particles.
The desiccant in the filter (usually in the form of silica gel or activated alumina) also serves to protect the system by removing harmful moisture from the refrigerant.