bohica2xo wrote:Let's start with the flushing - What solvent are you flushing with? How are you removing it?
Next the oiling - it sounds like you had too much oil once, and are overcomplicating the oil charge.
The only way to be sure of the oil charge is to clean the system to bare metal & drain the new compressor. THEN add the 10 ounces - as much as the compressor will take, and the balance in the accumulator inlet.
Evacuation should be done with both service valves open. You can NOT evacuate only the low or high side of an assembled system - it is a loop. Once you have installed the oil charge & closed up the system, evacuate to a rough vacuum of 25 to 28 inches Hg, then close the valves & shut off the pump. Wait for the oil to de-gas for at least 15 minutes. Then evacuate to 29+ inches for 5 minutes. Close the valves & check for leaks. If the vacuum holds it can be charged.
You mentioned Harbor Fright. They sell an ok electric vacuum pump. The air powered unit does not create sufficient vacuum for refrigeration use and is a waste of money.
When it comes to charging, do NOT jumper the cycling switch. With the engine stopped, charge liquid through the high side. Hook up the first can as liquid & open the high side valve - it should take the whole can easily. CLOSE THE HIGH SIDE VALVE. Then start the engine & charge the remaining cans through the low side as always. The first can will be enough for the system to "short cycle" . This is ok, the cycles will get longer as you add refrigerant.
This sounds like a good plan. Make sure you have quality gauges. You're spending a lot of time on this and should have the correct tools to complete the job once.