The guys are right on with the advice on the orifice tube and the oil. You should also replace the accumulator. That's the cylinder on the return (suction) side of the system. It filters and removes moisture from the refrigerant before it gets back to the compressor. The part should cost @$50.00-$55.00. DO IT! It's cheap insurance for the job, plus, NOT replacing it may void any warranty you may have on your new compressor! At today's R12 prices, you really don't want to do this job too often.
(flushing the lines and condenser are good ideas, too!
do you have access to a recycler?)
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"Regret can be a harder pill to swallow than failure .With failure you at least know you gave it a chance..." David Howard
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