What Is the Expansion Valve (Orifice Tube) and How Does It Work?
The expansion valve, also known as the orifice tube in some air conditioning systems, plays a critical role in regulating the flow and pressure of refrigerant entering the evaporator core inside your vehicle’s cabin. This precise metering allows the refrigerant to convert from liquid to gas, absorbing heat from the cabin air and enabling efficient cooling. At Nationwide Mechanics, we connect you with licensed mobile mechanics who can professionally inspect and replace your expansion valve or orifice tube right at your location, ensuring your AC system functions optimally.
Keep in Mind
Air conditioning repairs involve handling refrigerants, which are regulated substances requiring trained professionals for safe and legal service. Excess moisture in the system can block the expansion valve, often indicating an issue with the receiver/drier that may need addressing as well.
How the Service Is Performed
- Recover refrigerant safely from the AC system
- Remove the faulty expansion valve or orifice tube
- Install a new, manufacturer-approved expansion valve
- Recharge the AC system with the correct refrigerant
- Test the system for leaks and confirm proper cooling operation
Our Recommendation
Whenever your vehicle undergoes AC repairs or refrigerant recharges, it’s important to have the expansion valve inspected to ensure it is operating correctly. A malfunctioning valve that fails to regulate refrigerant flow can significantly reduce cooling efficiency and lead to further system damage.
Common Symptoms Indicating Expansion Valve (Orifice Tube) Replacement
- Insufficient cooling from the air conditioning system
- Frost formation on the expansion valve while AC output remains warm
Importance of This Service
While air conditioning is primarily a comfort feature, it also assists in removing moisture for the defrost function, helping maintain clear visibility during humid or cold conditions. A properly functioning AC system, supported by a healthy expansion valve, is essential for both comfort and safety during adverse weather.
