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- How does the thermal expansion valve work?
The thermal expansion valve removes pressure from the liquid refrigerant to allow it to expand to become a gas in the evaporator. As the liquid refrigerant leaves the TX valve the refrigerant is at its coldest.
The thermal expansion valve is designed so that the refrigerant at the evaporator outlet must reach a temperature of 4-7°C before more refrigerant is allowed to enter the evaporator. The ‘superheat spring’ inside the expansion valve has a tension that determines when the valve opens and closes to control the amount of refrigerant entering the evaporator as the temperature fluctuates.
- What are the symptoms of a faulty thermal expansion valve?
The first sign that there’s a problem with the thermal expansion valve is that the air conditioner blows warm instead of cool air. This indicates that not enough refrigerant is entering the system.
If the air blows too cold or the evaporator frosts over, this also indicates a faulty thermal expansion valve.
- How much does a thermal expansion valve cost?
The price of a replacement TX valve varies depending on the model of vehicle. The cost can increase when other maintenance needs to be done on your air conditioner at the same time,
For example, it is best practice to flush the air conditioning system when new parts are installed. The expansion valve is controlled by a temperature sensor, if this is blamed for the TX valve failure, it may need to be replaced. The evaporator or receiver drier may also need replacing to ensure healthy functioning of the air conditioning system.
Make sure that you get a quote for labour costs when you ask about thermal expansion valve replacement.
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