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autoACsystems
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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
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Up
close look at an orifice tube
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?
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.
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.
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More
help for diagnosing and repairing auto A/C
Flushing A/C Systems
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Auto A/C Components Explained
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This was probably one of the best books on recharging
air conditioning that I have seen...
