![]() ![]() If either component fails or has an issue, it can disturb the performance of the AC system, which can cause it to underperform. The AC expansion valve and orifice tube work together to regulate the flow of the AC system. One of the first symptoms of a problem with the AC expansion valve or orifice tube is an underperforming AC system. AC system performing worse than usual and blowing warm air Usually a bad or failing AC expansion valve or orifice tube will produce a few symptoms that can alert the driver of a potential issue. When the expansion valve fails or has any issues, it can cause problems with the functionality and performance of the AC system. The expansion valve meters refrigerant flow according to evaporator temperature and the load and cooling demand of the AC system. Too much refrigerant flow and the evaporator core will freeze over too little and the evaporator core will overheat and compromise the efficiency of the AC system. It is usually installed at the evaporator inlet and works together with the orifice tube to regulate the flow of refrigerant through the vehicle’s AC system. Often fixing a "bad orifice tube" requires replacing the entire evaporator assembly.An expansion valve is an AC component that is commonly found on many road going vehicles. However, like the expansion valve the orifice tube regulates refrigerant flow through the system and filters debris which may come through in its screen. It therefore cannot vary the flow of refrigerant into the evaporator, but rather causes a permanent restriction in the system. Orifice Tubes: Unlike the expansion valve, the orifice tube is a simple fixed device with no moving parts.Talk to one of the pro mechanics at Harris Automotive Services, as this part can be replaced on its own and does not require the entire replacement of the AC assembly. This process of metering the refrigerant adjusts the flow according to the temperature of the refrigerant in the evaporator coil. The expansion valve is a complex valve that regulates refrigerant flow. Expansion Valves: Too much refrigerant causes your evaporator to get too cold whereas too little refrigerant would result in inadequate cooling.A failing expansion valve or orifice tube often causes a vehicle's air conditioner to blow hot air. ![]() It calculates the precise amount of refrigerant that can safely go into the evaporator. Your car or truck's AC system is under extreme pressure and the thermal expansion valve or orifice tube monitors the amount of pressure and the temperature of your A/C system. ![]()
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