What is the role of the expansion valve in a freon cooling system?

The expansion valve in a freon cooling system plays a crucial role as a metering device. Its primary function is to regulate the flow of liquid refrigerant into the evaporator coil, where it undergoes a pressure drop. This drop in pressure causes the refrigerant to expand and turn from a liquid into a low-pressure vapor, which is essential for effectively absorbing heat from the cabin air.

By controlling the amount of refrigerant that enters the evaporator, the expansion valve ensures that the system operates efficiently, preventing both freezing of the evaporator and unnecessary cycling of the compressor. This metering action is vital for maintaining optimal system performance and achieving the desired cooling effect within the cabin.