If you can afford the new one, by all means use it, If you install a used unit, you are just asking for trouble. It was taken out of the original unit for some reason.
compressors contain oil, that gets contaminated , if open to the air, it will absorb moisture which can result in acid in the oil, which will ruin the used compressor
You replace it when the parts and labor to repair it to working condition costs more than is reasonable. If it is the compressor, it is usually best to buy a new unit. The time to replacement will depend on how heavily it is used--in Texas, my a/c was aged at 12 years; in Arizona, it was 30 years.
Press one of the Schrader Valves to see if pressure is there. Turn AC on and look at the compressor clutch for engagement. If it won't kick on, the system is low or the compressor is bad must replace receiver/dryer asst also.
IF it is an upright freezer, then the answer is yes. The reason for this is that the compressor unit has a sump at the bottom which is a resorvoir for the compressor's lubricating oil, and if the unit is tilted over too far, that oil can get into places where it does not belong, which can result in damage to the compressor or plugging of the coolant tubes on restart of the unit. are you reatrdedno you dumb loser
Rotating shaft seal
It will run continuously if the refrigerant charge is off. The compressor, condenser fan and inside blower fan should all run at the same time. If your thermostat shows that the unit will not keep up, it will not stop. If the unit used to cycle ok, clean outside coil, change filter inside and put a thermometer on the register closest to the air handler. It should be around 52-60 degrees F.
Generally you can disconnect the clutch control wire connector and the clutch will not engage the bad compressor. Then you can install a new original belt. .. If both the clutch and compressor are locked up you can try to find a shorter belt and bypass the compressor. I would think this may be difficult because I don't believe they make a lot of different lengths in those type belts... You might find a good used clutch at a used auto parts yard and replace your bad one - just don't hook up the wires. luck!
If you are handy with a wrench you can purchase a used one from a junkyard and replace it yourself. That should cost you about $100.00. After that you can take it in to the shop to have the A/C system evacuated and refilled which should run around $75.00.
A coil spring compressor is a piece of repair machinery typically used in car repairs. They help to depress the coil spring in order to remove or replace it.
Recommend have a/c specialist replace compressor because system should be at the very least "evacuated" after compressor change to remove any contaminents in system. Thanks for your comments and advise. I have already had the system professionally evacuated, but they want a fortune to exchange the compressor to tune of $800.00 and I did get different estimates. My car takes R-134 which I can put in myself. Back in the 60's thru the 80's I used to replace the compressors and refrigerant until they disallowed that. I just need to know where the hidden bolt(s) are.
Generally, because something is wrong with it. Maybe a bearing went out, maybe the compressor is just worn, maybe it was damaged because of a refrigerant overcharge, compressor oil overcharge, or the wrong type of compressor oil used. Could be a number of reasons.
air compressor
NO!