Check pressure cutout switch on low line line (smaller of the two a.c. lines).
If the pressures are always equal running, the compressor is bad and would need replaced
No, if you mix them they will form a gel and ruin the compressor. You will have to have the system evacuated and replaced with the new refrigerant.
More than likely you need to have your refrigerant recharged. or your A/C Compressor needs to be replaced.
does the fan work? is the system charged with the refrigerant?
Your 1992 Lincoln Town Car takes 2.5 pounds of R-12 refrigerant or 2.75 pounds R-134 (if system converted)
Refrigerant level low or cooling fan not working. worst case would be that the compressor no longer can build enough pressure and needs to be replaced
The ac system will have to be drained of freon and the pressure released. Then the compressor can be removed and replaced. Replace all o rings along the way as well.
The system will need to be drained of Freon and pressure. Then the lines can be removed and the compressor replaced. Change all o rings during the procedure.
Possibly a low refrigerant charge
Make sure that there is power getting to the ac clutch when the switch is jumped. If the power is there then the clutch is bad and needs to be replaced.
Redoing an AC system is trick business, the system must first be evacuated by a vacuum pump to remove all air before the refrigerant can go in and the pressure switch will not allow the compressor to come on or it will short cycle. Assuming you did it all properly try disconnecting the wire to the compressor and jumping it to 12 volts, that will activate the clutch. If it comes on and blows cold then the switch inside the car might be bad or some other electrical issue such as relay or fuse is the problem.
form_title= Compressor Oil form_header= Replace the compressor oil in your car. What model compressor do you have?*= _  Has the compressor ever been replaced?*= () Yes () No What type of oil does your car use?*= _ 
You cannot return the compressor unless it is the reason your system is not working. No need to reuse the compressor as you will have a brand new unit anyway.
I am having the same problem, if you figure it out before me let me know!! email@example.com. Thanks.
The most likely reason the compressor is not coming on is because you are low on freon. The low pressure switch will keep the compressor from cycling on because damage to your compressor would result. You can jumper across the low presure switch with the engine running and A/C turned on, ( for short time only) this will provide you with question is my compressor clutch good, or am I just low on freon. The AC compressor relay switch may need to be replaced
No harm will come from driving it. You just don't want to use the AC system without any refrigerant in it - that could harm the compressor. The refrigerant also cycles the compressor oil, so running the compressor without the refrigerant in it is detrimental in this regard. Also, since you had to open up your AC system to replace the compressor, you should have also replaced either the receiver-drier or the accumulator (your vehicle will be equipped with one or the other, depending on whether you have a Thermal Expansion Valve system or Fixed Orifice Tube system - it'll never have both), as they contain a desiccant which will become fully saturated within five minutes of exposure to atmospheric air. The desiccant in these components is vital to the proper operation of the AC system.
Maybe a bad or loose wire on the compressor? Check the wiring real good for loose or dirty connections. Look for any cracks or breaks too. It's also possible that it's just a little low on coolant and it's a coincidence that you opened the hood and the compressor disengaged. Check the connection to the low pressure sensor and make sure you have enough refrigerant.
Was unit evacuated before recharge after compressor replacement?
Doesn't matter - if you open up the compressor, you open up the AC system. By law, this must be done by an ASE certified technician in an EPA approved shop with the proper equipment to evacuate and store the refrigerant. This prevents refrigerant from being released into the atmosphere. Whenever the AC system is opened up, the receiver-drier (if it's a Thermal Expansion Valve system) or accumulator (if it's a Fixed Orifice Tube system) must also be replaced.
first off you need to determine that i s the cause of your problem,, could be the clutch, hi lo switch, temperature control unit, or broken wire or fuse, if you determine the compressor internally destructed, the entire system refrigerant side is toast, everything along with the compressor needs replaced, plus add a high side filter, new receiver drier, orfice tube evaporator, condenser,and clean out the hoses unless it has a muffler, then they require it be replaced
Replace your a/c evaporator filter under dash. Liquid refrigerant is getting back to compressor causing belt to break.
i found out for myself that if you jump terminal a&b at the compressor relay the compressor will kick on so i replaced the relay and it works.
If the AC pulley is locking up when the ac compressor clutch engages, it's not a clutch problem, it's a compressor problem. But yes, the AC clutch can usually be replaced separately. The problem is, if the clutch is worn out the compressor is probably worn out as well. It usually isn't that much more to replace the whole thing.
AC compressors are relatively easy to replace, typically it's only the serpentine belt and a few bolts. The hoses are a little more trouble. Typically a worn or failed compressor has deposited debris in the refrigerant lines requiring that they be replaced or cleaned. The procedure is: 1, extract any remaining refrigerant from the system into an approved container suitable for recycling. 2, remove the serpentine belt, disconnect the refrigerant lines from the compressor then remove the bolts and lift out the compressor. 3, Examine the inside of the refrigerant lines, looking for any discoloration. If the remaining oil is not clear, you should flush all of the refrigerant lines to make sure they are completely clean. Since you'll be replacing the old R12 refrigerant with 134A, you should probably do that anyway. 4, Since the vehicle is "experienced", it would probably be a good idea to replace any of the rubber refrigerant lines. That way you can avoid some problems. Since they are that old they'll be leaking soon anyway so you're not really wasting money. 5, Replace the receiver/dryer. 6, connect the new compressor and refrigerant hoses. 7, Connect the serpentine belt. 8, evacuate the system. If you don't have an evacuation pump for air conditioners, have someone do that part for you. You need to verify that there are no leaks anywhere in the system BEFORE you put the oil charge or the refrigerant. Air conditioning compressors are not repairable by the home mechanic. Unfortunately your only option is to replace it.
It's the low pressure switch. Check the compressor wiring and be sure it is grounding. Sometimes the clutch gap gets alittle wide and has to be regapped.