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???