Recently I replaced a leaking A/C Compressor and I also replaced the Accumulator and Orifice Tube.
Like I do always, I did a Forum search and found several DIY posts that helped

One of the DIY posts indicated the Orifice Tube was located inside Compressor Hose connection to Accumulator but when I removed that connection the Orifice Tube was missing?
I presumed someone had removed it during an earlier repair and neglected to reinstall it so I oiled the new Orifice Tube and installed it inside Compressor Hose connection to the Accumulator.

Last week, after I competed replacing A/C compressor/Accumulator/Orifice Tube I brought the car to my mechanic(Niki) so he could put the system on a vacuum and recharge it.

Later that afternoon when I returned to pick up my car I mentioned my confusion surrounding the missing Orifice Tube.
Niki looked real puzzled and said "Was your car cooling properly before it started leaking?"
I said YES, it cooled great until the Freon leaked out of the Compressor.
He said "The Orifice Tube had to be in the system because the A/C system would not work without it."

I asked Niki to confirm the Orifice Tube location.
He said it's located near the right fender in the liquid line between the condenser and the evaporator.
I told him I was looking in the liquid line between the condenser and the evaporator (at the connection point to the evaporator) not at the right fender area.

So, it appears I have (2) Orifice Tubes installed in the liquid line between the condenser and the evaporator.

Niki scratched his head and said "I've never seen this before but your car is cooling properly - if you have problems bring it back and I'll check the Orifice Tube locations."

Question:
As long as my car is cooling properly should I be concerned I have (2) Orifice Tubes installed?

Thanks for your comments,
Bill

 

Although two orifices are not ideal I doubt you will have any problems.
The two orifices will share the pressure drop to the evaporator where the pressure between them will settle down to about half the pressure between the inlet and outlet of the line.
This is assuming the two orifices are the same size and the original one is not blocked with dirt. Probably a very good bet.

I expect the most significant concern is since the first orifice is providing some gas expansion then from that point on the hose to the evaporator will get cold.
This will result in condensation and heat gain, reducing the cooling capacity of the A/C.
Probably not very noticeable but you may want to watch the hose and if it looks like the problem is bad you may want to insulate the line a little.
In theory, having two orifices will reduce the system efficiency slightly but I doubt you will ever see it, clearly not enough to justify the cost of evacuating and refilling the Freon.

So, I don’t think you have anything to worry about.
If you ever lose all your Freon again I would remove one of the orifices.

 

Had poor cooling after completely evacuating and recharging. All pressures looked good. My orfice tube (and I thought ALL ORFICE TUBES) is in the line on the right front fender where the line is slightly thicker and fastened with a single bolt. Mine was dry and kinda clogged. Oiled it (AC OIL) and added about 4 oz of oil to the system before replacing it. Evacuated and recharged.

WHERE did you put the 2nd orfice tube. How did you get it to FIT?
BIGHANK

 

I installed it in the liquid line between the condenser and the evaporator (at the connection point to the evaporator). It fit perfectly.