Wed. Jul 24th, 2024

During the summer months when temperatures soar, it’s best to travel by air-conditioned vehicle. When discussing the AC system of a vehicle, the expansion valve is a crucial component of control. The expansion valve regulates the flow of refrigerant into the evaporator. Let’s get to know the car’s air conditioning system’s expansion valve better. 7Days Aircon Servicing Pte Ltd is the best option for your AC servicing. 

Function of Expansion Valve:

The expansion valve controls the amount of liquid refrigerant that flows through the AC unit. A car’s air conditioner has it as one of its primary components. The center of the evaporator freezes when too much refrigerant is present. When the core overheats, the refrigerant level drops. The expansion valve monitors the temperature of the evaporator and adjusts the rate of flow of refrigerant accordingly.

The flow of refrigerant in an air conditioner is regulated by a rod inside the expansion valve. By raising or lowering the rod, the refrigerant’s flow channel is blocked or opened. If the passage is clear, the refrigerant can go through and likewise if it is blocked. When the temperature’s setting on the car’s air conditioner is increased, more refrigerant travels through the tube, resulting in cooler air.   

When it comes to regulating the flow of refrigerant, the air conditioner expansion valve primarily functions as a meter. What this means is that the valve controls the amount of refrigerant that can go down the channel based on the required temperature. Consequently, it is imperative that you have your car’s air conditioning serviced on a regular basis in order to survive the scorching temperatures while driving and for that the professionals at are best.

Commonly Used Expansion Valve in Car Air Conditioner:

Expansion valves come in a variety of designs, but they all follow the same basic principle. The temperature of the evaporator determines how long the valve remains open to allow refrigerant flow. The evaporator won’t freeze up or get too hot if the valve is closed. The automotive industry makes extensive use of thermal expansion valves (TEVs). 

Thermal expansion valves can have their levels adjusted from either the interior or the outside. The evaporator’s internal pressure varies depending on the location of the needle. When used in automobiles, valve equalization is handled by a system outside of the vehicle itself.

Indications of A Defective Expansion Valve:

  1. Warm Air Blown From Vents:

If the air conditioning vents in your vehicle are blowing warm air, there is a good chance that the refrigerant is not travelling freely through the refrigeration system. This is an ordinary sign that arises if an expansion valve is not operating properly. 

  1. Frost on the Vents:

The formation of ice on air vents may be the result of a defective expansion valve. The vent produces air that is notably chilly. This occurs when the expansion valve malfunctions, which then allows an excessive amount of refrigerant to flood the system.

  1. Always Running Air Conditioner:

A broken expansion valve of the air conditioner in a car might result in a continuous flow of refrigerant into the AC system of the vehicle. The constant pumping of the refrigerant by the compressor does nothing but add to the strain that is placed on it. Automobile air conditioners are also susceptible to malfunctioning for this reason. 

  1. Unstable Air Movement:

Inconsistent airflow from the air conditioner is another sign that the expansion valve needs replacing. This occurs because the valve’s ability to control the flow of refrigerant throughout the system has been compromised.  

The temperature of the air coming out of the vents may be inconsistent. If you notice a change in airflow, you should check the air conditioner’s expansion valve right away.

  1. Defective Auto AC System:

Long-term neglect of the aforementioned symptoms can lead to failure of additional components in the car’s AC system. The car’s air conditioning will break down as a result of this. Be careful to get the vehicle serviced at the recommended intervals. If, despite regular maintenance, the vehicle is still giving you trouble, you should get rid of it and get something new. 

By Syler