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maybe a 50/50 chance that it will still work fine,the only problem that i had was that some of the seals had dry-rotted a little,and started to leak out over a few months.
 

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Mine sat for a year outside. I put some 134 back in it last night and froze my ass off coming to work this morning. 93+ and almost 100% humidity I gots to have my a/c.
 

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Just reinstalled mine after being out a year.
I also installed all new orings in all the lines and at the pump mating flang and it only cost me 10 bucks for parts, a good investment being it will cost you around 150 bucks to get youe system evaced and filled.
you need to have this done before it s filled or the moisture inside will freeze and it will trash your pump.
Also if your a/c pumped is drained you will need to put around 4 oz of oil in it before installing it or you will trash your pump.
If it would help I have a ford service manual on cd rom and can send you what it says for doing your ac system
Let me know
Mike
 

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Here is a cut and paste from the service manual

Refrigerant Oil Addition

The A/C compressor (19703) uses a special refrigerant oil Motorcraft YN-12b or equivalent. This oil contains special additives required for the A/C compressor.

It is important that only the specified type and quantity of refrigerant oil be used in the A/C compressor. If there is surplus oil in the system, too much oil will circulate with the refrigerant, reducing the cooling capacity of the system. Too little oil will result in poor lubrication of the A/C compressor.


During A/C Compressor Replacement

NOTE:
The suction accumulator/drier (19C836) and A/C evaporator core orifice (19D990) must be replaced and a filter kit installed whenever the A/C compressor is replaced.

1. When reinstalling the existing A/C compressor or installing a new A/C compressor, remove as much oil as possible. On both A/C compressors, the shaft should be rotated about six to eight revolutions while pouring the oil from the ports. This effectively empties the A/C compressor of oil.

2. Obtain a clean container that can also be used as a measuring device.

3. Place the A/C clutch (2884) assembly on the A/C compressor shaft so the shaft can be rotated.

4. NOTE: Service A/C compressors are shipped without compressor oil.

Rotate the shaft by hand six to eight revolutions, collecting the oil in a clean measuring device.

5. If the amount of oil drained from the old A/C compressor is between 85-142 ml (3-5 ounces), pour the same amount plus 30 ml (1 ounce) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B into the new A/C compressor.

6. If the amount of oil that was removed from the old A/C compressor is greater than 142 ml (5 ounces), pour the same amount drained of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B into the new A/C compressor.

7. If the amount of refrigerant oil that was removed from the old A/C compressor is less than 85 ml (3 ounces), pour 85 ml (3 ounces) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B into the new A/C compressor.


R-134a Refrigerant Oil

CAUTION:
Do not add R-134a refrigerant oil to an R-12 system. Also, do not add R-12 refrigerant oil YN-9 to an R-134a system. Mixing these two types of refrigerant oils may cause poor lubricant circulation resulting in component failure and damage to the A/C systems.

The refrigerant oil required for R-134a A/C systems is a polyalkalylene glycol (PAG) oil (Motorcraft YN-12b) or equivalent meeting Ford specification WSH-M1C231-B. This type of refrigerant oil was made specifically for R-134a systems and is not suitable for use in R-12 systems. Never use an R-134a refrigerant oil in R-12 systems.


During Component Replacement

When replacing a component of the refrigerant system, follow the correct procedures to make sure the total oil charge is correct after the new component is installed. During normal A/C operation, oil is circulated through the system with the refrigerant and some is retained in the A/C compressor. If certain components of the system are removed, some of the refrigerant oil will go with the component. To maintain the original total oil charge, compensate for the oil lost by adding oil to the system with the replacement part.

For the A/C evaporator core (19860), add 89 ml (3 ounces) of clean refrigerant oil to the suction accumulator/drier inlet tube whenever the A/C evaporator core is replaced. This will compensate for the refrigerant oil lost in the replaced A/C evaporator core.

For the A/C condenser core (19712), add 30 ml (1 ounce) of clean refrigerant oil to the A/C condenser core or the suction accumulator/drier if the A/C condenser core is replaced.

When replacing the suction accumulator/drier in conjunction with another component of the refrigeration system, measure the amount of oil drained from the removed suction accumulator/drier into a suitable container.

l Drill two 13 mm (1/2 inch) holes in the bottom of the suction accumulator/drier to drain oil.

l Add the same amount of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B plus 60 ml (2 ounces).


Other Refrigerant System Components

Replacement of other refrigerant system components such as hoses, compressor valves, A/C cycling switch, and other system components does not require the addition of refrigerant oil.
 
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