The basic theory is something that you can verify using an aerosol can. This changing from a high pressure to a low-pressure generates icy cold. The process leaves a low pressure liquid directly on the other side of the component. The brass hole of a predetermined size meters this refrigerant. On one side of the orifice tube is a high pressure refrigerant liquid. This is something that stuck with me and is a good representation of what the part does. I remember when I went to a General Motors sponsored air conditioning class the instructor called the orifice the exact place where the cold happens as I mentioned above. A lot of these cars are still on the road and drivers want to get their air conditioning working again. Another reason we’re talking about this part first is, because the troublesome cars from the 90s and early 2000s most often use the orifice. This is especially true on old automotive AC systems with failing internal components. Unfortunately, due to the small size of the hole and it being the only screen in the refrigerant system, it becomes an issue when internal degradation happens with age. Since there’s no moving part this component would probably last forever Yes, I would rather have an orifice tube in my car air conditioning system. As for the orifice it's a simple copper tube surrounded by two screens. This is because the expansion valve has a temperature sensing device and moving parts. It can actually be more troublesome than the orifice assembly. We dedicated an article to the expansion valve as well. The point to make here is you either have one or the other, you will not have both. In fact, the older your automobile, the more likely it will have an expansion valve instead of an orifice tube. Some vehicle manufacturers decided to use a metering device known as the AC expansion valve. With that said, not all vehicles will have one. When high pressure switches to low pressure wonderful frostiness results. One thing to get out of the way is this part becomes the dividing point between the high and low pressure refrigerant sides. Here we'll explain exactly why, what to look for and how to replace the least expensive A/C component in the entire system. The filter screen shown in the graphic can clog and restrict flow. The reason is this device becomes real important on medium and high mileage automobiles. I'm dedicating this page to the orifice tube used in automotive air-conditioning systems. Orifice Tube in Automotive Air Conditioning
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March 2023
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