Why consider going into the sealed system at all? Are you saying that you have to buy and install a complete new compressor and clutch just to get the clutch part? If so then bleed the system off slowly to save what oil you have. Whether you need to worry about compressor oil or not depends on the type of compressor. If a piston like the old Yorks you have an oil sump. If the wobble box rotary compressor which most are these days the oil is all over the system. If you bleed the system slowly where you don't vent much if any oil I wouldn't worry about adding oil either. New compressor may already have a charge amounting to what you would loose in your od compressor.
Agree on the vacuuming. Gotta get the internal pressure down to a micron vacuum to boil out any moisture in the system. Course if the system is sealed, and the compressor is sealed, and you get everything ready and make the change on a hot day with low humidity, you probably don't have to worry about that. However, the vacuum helps in getting the freon level into the system before you fire it up and set up your pressures.
If you never broke into an ac you might go to UTube and look at a video. The other thing is reclaming the freon. Not up to speed on current laws, but you can't vent Freon 12 and 22. Have to capture it in a tank and then do what with it......
Also have to get the right freon 134a? for your system and compressor. The evaporator, condenser (coils), and compressor make a matched set for a given freon.
Maybe you ought to just pay somebody that does it for a living to do the job for you. If you were just going to unbolt a clutch and replace it with a new one, no big deal. To change out a compressor and get the recharge right takes somebody that knows what they are doing.
My references are National Tech Schools, Master course in Heating, AC, and Ref. plus many 10's of years of servicing my and other folks units on a casual basis.
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