Which component is responsible for absorbing moisture in an A/C system?

The receiver/drier is a crucial component in an A/C system, primarily responsible for absorbing moisture. This function is vital because moisture can lead to the formation of acid and contaminants within the refrigerant, potentially damaging the system and reducing its efficiency. The receiver/drier contains a desiccant, which is a material that has the ability to absorb water vapor from the refrigerant. By doing so, it helps maintain the integrity of the refrigerant and protects the system from issues associated with moisture, such as corrosion and ice formation on the evaporator.

In contrast, the accumulator, while it also plays a role in moisture management, primarily functions in systems that use a thermal expansion valve and is designed to store excess refrigerant and prevent the compressor from ingesting liquid refrigerant. The condenser's main purpose is to dissipate heat from the refrigerant as it condenses from a gas to a liquid, and the expansion valve regulates refrigerant flow into the evaporator while maintaining the required pressure difference.

Therefore, the receiver/drier is specifically engineered to handle moisture absorption efficiently, making it the correct answer in this context.