Ac compressor oil

I replaced my ac compressor, condenser and evaporator valve in my 05. The old system was depressurized, and when I pulled the old compressor there was very little oil in it. The new compressor has a sticker on it that says it's filled with oil however when I removed the shipping plugs to connect the lines there was no leakage despite the holes being where they are...
My question is should I trust the label on the new compressor and just recharge the r134 (after I vacuum the system) or is there a way to know how much oil you have/need? Hope that reads clearly. If anyone can share their knowledge, thanks
Joe

 

Did you flush the evaporator?

Did the tag say how much oil was in the compressor?

 

I haven't flushed the evaporator, and the tag on the new compressor doesn't specify any volume. I bought a ac compressor/condenser/expansion valve kit and just replaced those parts so far. I was going to pull vacuum on the system for an hour or so to remove any moisture, then recharge 22oz of r134 as called for. Am I missing something? Being almost 20 year old truck is the reason I'm attempting this repair myself.

 

The typical method for oil when just changing the compressor is to drain the oil from the old compressor, measure it, and add that amount to the new compressor.
If the new compressor is shipped with oil you drain it and add back the same amount drained from the old one.
Some compressors have a plug to take out to drain and fill the oil, others are drained and filled through the ports.

Since you replaced the condenser you would also add 1.4oz of oil.

 

Thank you, this is what I was looking for. I'll post the results in a day or two. Definitely learning a lot on this one.

 

Yea getting the correct amount of oil in an A/C system is pretty difficult unless your flushing/replacing everything where your starting with a known amount, when just replacing some components you pretty much just have to settle for "close enough".

It's not an ideal way of doing it but it's really the only way because there's no realistic way of knowing how much oil is trapped in each component of an A/C system.

 

Alright, the job is done, great success! The system held vacuum for an hour, then vacuum again for an hour to draw out moisture. Added 1.4 Oz compressor oil, 22 Oz r134a and now it's like new. Thanks for the advice, this forum is a treasure trove.

 

In my experience,

folks generally don't add oil for a compressor and are fine. It's supposed to come pre-oiled. Especially if it's a quality part.
And, things like that are also supposed to come vacuum-sealed. For example, if the factory pre-fills it with oil, adds a vacuum to it, and installs the caps
before you open it, that makes opening the caps difficult, which is a good thing. Because it's under vacuum, helping keep the caps in so they remain during shipping, to keep the oil in.
Inside the compressor.

Hopefully it's not one of those cases where the box of the compressor looks like someone punted it off a roof before delivery.

You're also still gonna have some residual oil in the rest of the system.
I have seen people add 5-10ml during a service. If you watch the machine during a service it takes some out, allowing you to put it back in. Some people don't. Both work.
It's gonna be settling in other places as well, and mixed in with the gas which is the point of how it's designed chemistry-wise.

Too much and you'll hydrolock the compressor.