Pete 379 air conditioning

Vacuum it down add low as you can get it. Put the pump oin there and go do something else for thirty minutes. A cheap pump is only gonna have a 1/4 hp pump on it so its gonna take a while. Gerry it as low as you can, but as long as its got a 30 lb vacuum it will be fine.

You hook up the vacuum through your gauges.
You don't need to add any oil, it isn't going to suck oil out, only the gases. After sucking it down add how ever much Freon your system calls for. Should be a label on the hvac box listing how many pounds.

 

You need to add 2 ounces of oil for a major component replacement like a condenser.

 

Internet full of really professional explanation how car (truck) AC system works. oil not suppose to go out of compressor into system but some oil could blew out in event of rapid discharge. To fill oil properly you have to drain oil from compressor and fill it by manufacturer manual.
If system was open long enough time oil will absorb water.
To remove water change oil or vacuum system in cycles. Water starts evaporating and vacuum pressure will go up slowly.. Vacuum it until pressure is not changes after 1 hour the vacuuming stop. If you can not achieve stable vacuum the system is leaking.

 

The oil is supposed to leave the compressor, it is designed to travel with the freon so there is always lubrication in the compressor combustion chamber.

 

You sure you supposed to do that with a prefilled compressor buddy? Not saying you are wrong but that was what I thought. I never added additional oil when I replaced my unit based on everything I read. They say 2 much oil will cause poor cooling

 

Doing that without evacuating he system is just going to over fill the system with oil. Op isn't going to spend 4k bucks an an ac evac and recovery machine, he is spending 50 bucks on a small vacuum pump.

 

A common cause of compressor failures is lack of oil caused by slow leaks. Sometimes even over years of add freon, add freon, add freon. As stated oil travels with the freon and if you are loosing freon you are loosing oil.
When you replace a condenser you should flush the entire system and start from scratch. You have no idea how much and what type oil is in it other wise. Rotary compressors can be flushed by connecting a blow nozzle to the suction port and turning it by hand. Nitrogen is prefered. Then run your flush product through it the same way. Put at least some of the new oil directly into the compressor and turn it. Piston compressors are a bit different.
I thank Spider pretty much knows the history of his A/C but you do not. I would start from scratch.
Already rambled on to long so I will stop.