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This was probably one of the best books on recharging
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autoACsystems
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
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Orifice
tubes & TXV's (Expansion Valves)
Here
is a real close up look at a typical orifice tube location. This particular
application is a 2003 Lincoln Town Car, but almost all orifice tubes can
be located by simply finding the 'dimples' on the high side liquid line.
Also remember that the orifice tube separates the HIGH PRESSURE Liquid
refrigerant coming from the condenser and changes it to LOW PRESSURE Liquid
refrigerant entering into the evaporator.
Why
different locations for the orifice tubes? Remember that the orifice
tube has a 'fixed' opening. That means that it is always allowing refrigerant
to pass through into the evaporator because of the difference in pressures
between the high and low pressure sides of the system. When the vehicle is
turned off, the orifice tube continues to allow refrigerant to flow. That
allows the system to 'equalize' (high pressure will always equalize with
the low pressure until the pressures are the same). That 'equalization'
of the system causes a 'hissing' sound. That sound could be heard inside
the passenger compartment of the vehicle and was a common customer complaint.
Therefore, motor vehicle manufactures resolved the problem by moving the
orifice tube 'upstream'. They can be located 'midway' between the condenser
and evaporator (in-line) or right at the condenser outlet. They still function
the same, it's just their location moves.
Return
to Fast Track Information on Orifice Tubes from
autoACsystems.com!
A
Close up look at the Orifice Tubes:
What's
wrong with these orifice tubes?
How can you help prevent this?
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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Top 10 Mistakes Servicing Auto A/C
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Top 10 Little Known Auto A/C Facts
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This was probably one of the best books on recharging
air conditioning that I have seen...
