Well, I got the old compressor out and the system has been flushed out. I have new orifice tubes for front and back and I have also replaced the pressure switch on the accumulator with one that supposedly is set for 134 (AutoZone lists 2 different ones for a 91....one for R12 and one for systems converted to 134). Hopefully tomorrow I'll be able to install the new compressor and charge up the system. I do have one question:

Prior to installing the used compressor from my 90, I installed a new accumulator. After the compressor was in, the a/c system only ran long enough for me to charge it with 36 oz of 134, then the compressor locked up. Can I still use the accumulator or should I replace it before putting in the new compressor?????Hate to go the money for a new one again.......

 

replace, accumulator can not be flushed effectively especially with ineffective home aersol flush cans....
any compressor particles are probably trapped in present accumulator which is the compressor's last line of defense....

far cheaper than another new compressor....
flush system and do a dry compressed air followed by nitrogen gas blow out if you have access to tank...flush and air blast condenser, hoses and evaporator both directions using finger with rag over outflow end to fluctuate pressure

what was in the old orfice tube screens?
http://ackits.com/blackdeath/blackdeath.jpg

use oil recommended in new compressor specs, probably low viscosity 46 PAG for non GM apps....

 

It is not possible to preserve the old accumulator after major service, such as flushing. The only thing that can really be done, is if you were able to cap and vacuum out the accumulator imediately, with tools that I don't think exist outside of the manufactureing of these.

 

The accumulator was not in the system when I flushed it. I removed the compressor and the accumulator and disconnected all of the hoses and then flushed the condenser, evaporator core (front and back) and the hoses and the pipes going to the back unit.

 

Doesn't matter, the accumulator must be under deep vacuum or filled with refrigerant at all times once it has been installed. When new, they have all openings capped, and the air inside is totally inert moisture free gas. Once those caps are removed, you have to install it quickly, otherwise it starts to pull moisture out of the air. When you remove it, I suppose you could fill it with refrigerant, CO2, or nitrogen, but I doubt you still have the plastic caps. This si still a risky idea, since if it becomes contaminated, it can easily destroy the next compressor.