Expansion Valves: The expansion valve is a complex valve which regulates refrigerant flow at the evaporator inlet with an internal moving rod mechanism. This rod opens and closes to differing heights based upon the cooling burden put upon the system. This process of metering modulates the flow according to the temperature of the refrigerant in the evaporator coil. Too much refrigerant could cause the evaporator to get too cold and even freeze up the coils. Too little refrigerant would result in inadequate cooling.

Auto Ac Orifice Tube Locations

Step 2: Locate the orifice tube in your vehicle. You can refer to the service manual for your vehicle for the exact location of the orifice tube. In most models, the tube is located in a Y-shaped junction between the condenser and the front evaporator. Some vehicles may also have the tube placed on the side of the radiator near the mounting. No matter the situation, Advance Auto Parts has the Expansion Valve & Orifice Tube product you desperately need. We currently carry 9 Expansion Valve & Orifice Tube products to choose from for your 2005 Buick LeSabre, and our inventory prices range from as little as $2.99 up to $118.99. Here's a quick video to describe the proper way to install a fixed orifice tube in a mobile air conditioning system. Here we are working on a 1998 Chevrolet. Where is the location of the air conditioning orifice tube on a 2000 4.7L Dakota - Answered by a verified Dodge Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.

The refrigerant which enters the expansion valve is high-pressure liquid, and is warm. The liquid which flows through the valve and enters the evaporator is low-pressure and cold. This is the exact point where the refrigerant has passed from what is known as the “high side” to the “low side” of the system.

Orifice Tubes:

Unlike the expansion valve, the orifice tube is a simple fixed device with no moving parts. It therefore cannot vary the flow of refrigerant into the evaporator, but rather causes a permanent restriction in the system. However, like the expansion valve the orifice tube regulates refrigerant flow through the system and filters debris which may come through in its screen.

Gm Orifice Tube Location

It becomes necessary to replace the orifice tube if the fine mesh screen or the internal components of the orifice tube become plugged, restricting refrigerant and lubricant flow. Orifice tubes also designate the dividing point between the “high” and “low” sides of the system.

LMK 2019