Orifice Tubes, Expansion valves & TXV's - Auto A/C Diagnosis & Troubleshooting Help from the world leader in auto A/C information!

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Your best source for complete troubleshooting and diagnosis information on auto A/C systems. Our information provides proper repair, recharge, service and maintenance procedures for all automotive air conditioning systems. Regardless if you have a current CCOT (cycling clutch orifice tube) system or an expansion valve and POA valve system, we've got the information you need. From step-by-step help on retrofitting and recharging to complete A/C compressor or component replacement, our A/C manuals provide you a quick and easy methods that have been proven helpful to everybody from the apprentice to the professional.

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Up close look at an orifice tube
A/C orifice tubes are now made in several different colors and designs. This is a typical GM White Orifice Tube located at the A/C Evaporator Inlet
This is a photo of the original design orifice tube, know referred to as the GM White orifice tube. This design is located at the evaporator inlet. Notice the 'TABS' on the inlet side. They are used to remove the orifice tube with a proper orifice tube remover tool. Some techs will use needle nose pliers to remove the tube, but you must use caution so that you don't damage the inlet screen.

The o-ring seals and separates the high pressure and low pressure sides of the A/C system, forcing all the refrigerant to pass through the 'brass' orifice. Also note the flow arrow that indicated the direction of refrigerant flow. One other caution... always be sure to install the replacement orifice tube the proper way!

See photos of other typical orifice tubes used in current applications here!

What's wrong with these orifice tubes?
How can you help prevent this?
Auto A/C orifice tube photo shows serious restrictions! How can you prevent this from happening? Install an in-line A/C filter from the COOL ZONE! As stated above, orifice tubes can easily become restricted with debris that may travel through the system. Restricting the orifice tube immediately restricts the flow of refrigerant. It also limits the flow of refrigerant oil. The oil is required to maintain compressor lubrication. Therefore, orifice tube restrictions can easily cause a catastrophic compressor failure. Auto A/C orifice tube photo shows serious restrictions! How can you prevent this from happening? Install an in-line A/C filter from the COOL ZONE! What causes the debris and contamination? In short, moisture which enters the system mixes with the refrigerant to form acids. Those acids corrode aluminum components. That corrosion moves throughout the system and get caught by the filter screens on the orifice tube. As shown on the left, if takes less than 1/10 of a teaspoon of debris to plug the orifice tube.

How can you prevent this from happening?


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