Posts Tagged: AC expansion valve

How AC expansion valve system works

Auto AC Expansion Valve System Operation Many car makers now use automotive AC expansion valves instead of the less efficient orifice tubes in their AC systems. An expansion valve is simply a refrigerant metering device to control the rate of flow of refrigerant into the evaporator located in your dash. In the illustration below, you’ll see that low-pressure refrigerant gas flows out of the evaporator coil and through the expansion valve. As it flows, the refrigerant’s temperature is detected by the rod running through the port. The rod is attached … Read More