I think it is factory
It is in the inlet tube to the AC evaporator core at passenger side rear of engine compartment.
SOURCE: 97 ford windstar 3.8
oriface is a pipe like structure in which pressure of the liquid is increased
SOURCE: location of orifice tube in 2004 ford taurus
orfice should be located on the accumulator, where the large line connects.
SOURCE: Where, exactly, is the orifice tube located on my truck?
the orfice tube is locate in the line between condenser and evaporator. near the spring lock coupling. you must unbolt the cruise servo and overflow bottle, reposition them out of way and you will see the line connection..the orfice is inside line near that uniion. the ac system must be evacuated prior to removal, and recharged afterwards..
SOURCE: loacation of the orifice tube
The AC evaporator orifice always has to be after the electronic freon release valve after the receiver/dryer, and the evaporator itself.
It is optimal for it to be as close to the evaporator as possible, so sometimes it is even part of the input for the evaporator.
However, it is best if it is separate, because the orifice often gets clogged.
But the most common cause of clogging is ice, so try a vacuum pump to desiccate any moisture out first.
If the clog is ice, you can tell by heating the orifice and melting the ice.
Careful not to get it too hot though.
You don't want to damage hoses, and if freon gets into a flame, it can be toxic.
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