Yorks come in different sizes, BTW. Of the three different stroke models, the long stroke York is the most desirable. The longer the stroke, the bigger volume of air pumped per minute. The easiest way to determine the output or stroke of the compressor is to look at the crankshaft. To get to the crankshaft, you must remove the pulley. This can be done by removing the bolt and washer holding the pulley on, and running a 5/8" coarse thread bolt in to force the pulley off. All models have a flat end on the crankshaft; the edges of the crankshaft are what's important. A beveled edge on the end is the short stroke. If it has a sharp corner, but is grooved for a retaining clip, it's a medium stroke. And if it is a sharp corner without any grooves, it's a long stroke. If the compressor still has the original Motorcraft metal tag bolted to it, you can use that for reference also. It will have a series of five numbers/letters. The last three are the displacement, and direction. Of those last three digits, the last letter is the output direction and the other two are the stroke. The three stroke numbers are: 10 = long stroke, 09 = medium stroke, 07 = short stroke. The Discharge Direction letters are: L = left, R = right. So if it's a **09R, then it's a medium stroke with a right side discharge. Of the vehicles that used York compressors, the long stroke model is most common in late 70's to early 80's Volvos. Really good YORK
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www.coloradok5.com/york.shtml Once you found one how to check it
out:There are two things to test for: 1. If the clutch works, and 2. If the compressor pumps air. To test the clutch, look for a single wire coming out of the compressor. This is the wire that is normally connected to the A/C switch on the vehicle, and controls the clutch/pulley assembly. When the wire receives power, it "locks" the clutch, and turns the crankshaft on the compressor. The outer part of the pulley assembly is always turning when the engine is running, and it should spin freely. The inner part of the pulley is what actually makes the compressor turn. To test the clutch, ground the compressor, and touch the single wire to a positive battery terminal. You should hear a "click" when you apply power to the wire. This "click" is the outer part of the pulley, locking to the inner part on the crankshaft. You should be able to turn the pulley with it locked and be able to hear air being pumped. It should also be harder to turn because of this. Also, when you remove the wire, you should hear a "click" again, and the outer part of the pulley should disengage and spin freely again. It is also a good idea to plug one of the hoses with your thumb and turn the crankshaft (inner part of the pulley) with or without the clutch being engaged. Depending on which direction it's turned, it should either suck or blow air against your thumb. It's a good idea to turn it both ways just to be sure it works. If the compressor fails either of these two tests, it has internal damage, or a bad clutch. New clutches aren't cheap, so be sure to get one that works.