A/C Compressor Dilemma

After having recently charged my original A/C compressor with oil (the system was blowing cold already), about a week later it seized. When I removed it, it was dry...no oil. And the system was still blowing
cold as it seized -- the R134a hadn't leaked out. People told me for the oil to leak out, the gas has to leak out too. Guess they were wrong. The two hoses going to the compressor have some blistering bubbles in the outer layer of rubber. I guess those are slow freon leaks, right? But, still the A/C was always cold. I replaced the compressor w/ an AutoZone remanufactured unit. I evac'd and charged the system with freon and oil. A week later, this new compressor seized in the middle of the A/C blowing freezing cold. Again the freon hadn't leaked out. I am assuming the compressor is out of oil. There are no signs of leakage though. Maybe a little cruddy oily stuff on the bottom compressor hose whipped up on it from the last compressor I assume.
I didn't replace the receiver-dryer and know when you get a compressor done somewhere, they will not warranty it unless you replace that.
Could that be causing these compressors to fail, and if not what could be???
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What kind of car (year, make, model) and what kind of oil did you use?
Paul

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If the pulley on the compressor and the driving pully on the crank aren't in perfect alignment, that could put stress on the compressor bearings and cause seizure. Ain't necessarily about the freon at all!

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Did you put oil in the compressor before you install it? You said your hoses were blistering? Why didn't you change it?
Filter/drier is exactly what it is... it filters craps that got in the system... so if you don't change it... craps still there. Sometime those filter stuff break down and travels all over the system.
What is the pressure in your system? I know you can't run the compressor... static pressure can tell me if you lost freon or not...
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