Which component circulates refrigerant through the A/C system under pressure?

• A. A/C Compressor
• B. Condenser
• C. Evaporator
• D. Receiver-Drier

Answer: (A)

The component that circulates refrigerant through the system under pressure is the A/C compressor. It draws low‑pressure vapor from the evaporator, compresses it to a high‑pressure gas, and pushes it into the condenser, keeping the refrigerant moving and maintaining the system pressure. From there, the refrigerant is condensed into a high‑pressure liquid, stored and dried, then throttled by an expansion device into the evaporator where it absorbs heat and returns as low‑pressure vapor to the compressor, continuing the cycle. The other parts (condenser, receiver-drier, and evaporator) are heat exchangers or storage/conditioning stages, not the component that drives circulation under pressure.