Prostar A/C Oil Question

2009 International ProStar w/sleeper.

I am replacing my A/C compressor and Have a question of "how much oil to add"

I know the system has a 300cc (10.14oz) capacity.

I have bought the compressor from International. Is it pre-Filled with the 300cc of Oil?

If not how do I determine how much oil is remaining in the system or is there some rule of thumb to follow.

I am replacing the compressor, Receiver/Dryer and the expansion valve on the cab side.

I am replacing the R-134a that, to my knowledge, is not charged with oil and DOES NOT have the sealant and dye in it.

Thanks for the help!!!

 

Thanks HeavyD.

That should get me in the ballpark. Front seal of compressor bad so know telling how much oil went with it.

Ideally I would flush the entire system and start over, but I am not equipped to do so.

 

Well I couldn't get even an oz of oil to come out of the new compressor same goes for the old.....
So I plan to figure they just put enough oil in as needed during assembly.

The Receiver/Dryer is labeled "none" for oil.

I didn't flush any of the lines.

So I am going to go with 7oz; assuming there is at least 3oz left in the system. There is probably more than that so I may talk myself down to 6 by the time I charge the system tomorrow.

What I am still not sure of is the r-134a being pre-mixed with oil. The can does not say that it is, unlike the other brands that are labeled 11oz r-1134a and 1 oz oil/sealer. The cans I have just say 12oz of r-134a.

If anyone else has something to add please jump in.

Thanks to all!!!
VL

 

Yeah, been there. After I spent my first $650 to have International replace just the thermistors (only lasted 6 weeks) I figured it would be a smarter investment to buy a good set of A/C manifold gauges.

 

Yeah I tried that, but it didn't seem to pump much out so I left it sit upright for a few... not even an ounce came out. so I just left it be.