Simple way to test the expansion valve 

Refrigerant flow to an evaporator in a cooling system is controlled by expansion valves. Sensor bulbs, capillary tubes, diaphragms and valve bodies make up a thermal expansion valve. Calibrating liquid fills the thermal bulb, which is linked to the diaphragm through a capillary tube. To let refrigerant through, the diaphragm slides open and shut over the valve body. At, the professionals are well knowledgeable for performing any HVAC servicing. Consider contacting them for any AC problem.

In order to close the diaphragm, the evaporator pressure along the pulling force of a spring within the valve body work against the vapor pressure of the bulb. If your air conditioner isn’t cooling adequately, you should check its expansion valve. For getting your valve checked and inspected, please contact

Locate the air conditioner unit:

Place the air conditioner where it will work best, which varies depending on the use. Many centralized HVAC systems use both indoor and outdoor units. The indoor unit likely contains an expansion valve. Consult the service manual for your system if you need assistance for anything related to your AC or locating its parts.

Check that electricity is reaching the air conditioner:

This means confirming that that the electricity is on and the AC is plugged into the right outlet. Common 110-volt electrical outlets can power most air conditioners. However, a 220-volt outlet may be necessary for more substantial uses. Plug the air conditioner in securely, no matter what kind of outlet you’re using. Activate the air conditioner by switching the thermostat to the “on” position. Turn the heat off if the air conditioning in your home has that function.

Turn the thermostat to its highest possible setting:

As much as the thermostat will allow, decrease the surrounding temperature. On digital thermostats, this is accomplished by repeatedly pressing the downward arrow until the temperature stops fluctuating, which is often around 64 degrees Fahrenheit (18 degrees Celsius). Turn the fan up all the way if It can be adjusted.

Take off any coverings so the air conditioner can be accessed:

Most residential central air conditioners have large metal casings. The expansion valve may be behind a service panel that needs to be removed or a completely separate panel, depending on the design of your system. Put the air conditioner’s bolts somewhere secure until you’re ready to reassemble the case.

Look for the expansion valve inside the cooling unit:

There are many different kinds of expansion valves on the market, but the ones that include sensing bulbs are easily identifiable within a cooling unit because they take the shape of a cylindrical object with a nozzle protruding from one side and a disc on top.

Typically, a wire runs from the highest point of the disc to the sensing bulb. Check the service manual or go online to get a diagram for your specific air conditioning unit if you still are unable to find the valve.

Remove the sensor bulb from the bulb well:

This step varies widely depending on the air conditioner’s make and type. Locate the bulb by following the arrow from the expansion valve’s cap. In certain cases, you can simply slip the bulb free of the clamp that holds it after cutting away the insulating material on the line it is connected to.

The bulb will have an oval form with tapering ends, similar to an unwrapped metal tootsie roll. Keep the lightbulb’s cable attached. It is simple to take off the clip to which it is fastened.

Use the detecting bulb, hold it in warm water:

The expansion valve will activate if the sensor bulb is heated to a high enough temperature. One simple method is to immerse it in hot water for a few minutes. If this is not possible, just keep the light bulb in your palm for the entire time of the examination.

Without greatly raising the temperature, you can get by with only the sensation in your palm. You might find that having a cup of steaming hot water on hand helps while you wait for the light bulb to warm up.

Wait for 15 minutes:

The expansion valve needs time to open, so give it 15 minutes to respond to the heat from your palm or the water in the cup. Be ready to keep applying heat for the whole 15 minutes if necessary.

Valve activation could occur earlier than 15 minutes. That’s the absolute maximum time you’ll have to wait. During this period, you shouldn’t switch hands or take the bulb out of the water.

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