Question

In my fridge, only the expansion valve becomes a bit cold while the rest of the evaporator coil remains warm. Where is the problem?

Answer 1

If only the expansion valve in your fridge becomes cold while the rest of the evaporator coil remains warm, it could indicate a potential problem with the refrigeration system. The expansion valve is a component responsible for regulating the flow of refrigerant into the evaporator coil, where it undergoes a phase change from liquid to gas, absorbing heat and cooling the surrounding air.

Here are a few possible reasons for the described issue:

1. Low refrigerant charge: If there is a low level of refrigerant in the system, it may not be able to absorb enough heat from the fridge's interior, leading to insufficient cooling across the entire evaporator coil. The expansion valve may still become cold because it is receiving some refrigerant, but the lack of refrigerant in the rest of the coil will result in warmth.

2. Clogged or restricted refrigerant flow: A blockage or restriction in the refrigerant line, such as a clogged filter drier or a blocked capillary tube (the part connected to the expansion valve), can lead to improper refrigerant flow. As a result, only a portion of the evaporator coil may cool down, leaving the rest warm.

3. Expansion valve malfunction: The expansion valve itself could be faulty, not opening or closing properly, which can impact the refrigerant flow and cause an uneven cooling pattern on the evaporator coil.

4. Defrost system issues: If your fridge has a defrost system, problems with it could also cause uneven cooling. For instance, if the defrost heater or defrost timer is malfunctioning, it could prevent proper cooling across the evaporator coil.

5. Compressor problems: A malfunctioning compressor could lead to an insufficient circulation of refrigerant through the system, resulting in an unevenly cooled evaporator coil.

To diagnose and fix the problem, it's best to seek the help of a qualified refrigerator technician. They will have the expertise and tools to inspect the refrigeration system, identify the underlying issue, and perform any necessary repairs or maintenance to restore proper cooling. It's essential to address this problem promptly to avoid further damage and ensure your fridge operates efficiently.