Metering Devices. A/C Expansion device
Automotive A/C system Metering Devices
All A/C systems meter the refrigerant into the evaporator core for the purposes of controlling the evaporator temperature.
Types of metering devices.
Depending on the system, it could be a variable or fixed style metering device. It could be a Thermal Expansion valve or Fixed Orifice Tube.
Types of Metering Device and control type.
The variable style metering device: (Thermal Expansion valve, TXV ) controls the flow of refrigerant by sensing the temperature of the evaporator and adjusting the amount of refrigerant entering the evaporator by varying the size of the metering device opening.
The fixed system: (Fixed Orifice Tube ,FOT) uses a fixed metering device and controls the amount of refrigerant entering the evaporator core by controlling the operation of the compressor itself.
When should I replace the expansion valve or fixed orifice tube in my vehicle?
Orifices tube should be replaced any time the A/C system is serviced and particularly if the A/C system is found to be contaminated.
Thermal expansion valves are typically replaced if they fail to operate correctly.
Do you need assistance replacing your A/C expansion device ?
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