OK, I got a 2000 Civic, the compressor was busted (locked up and busted or something, like that when I got the car), the condensor was in pretty bad shape (fins bent up on the condensor). So I got a new compressoer, new condensor, new drier, new expantion valve, and new evaporator while I was replaceing the expantion valve. All the lines have been cleaned, and blown out with cleaner and air. Will replace all the o-rings and the valve cores on the low and high side lines. 4.3 oz-4.6 oz of PAG 46 (SP-10) will be the oil of choose to add to the AC system before chargeing

So there we have it, basically a brand new system, that has NO oil before going together other than the compressor. So my question is, where do I add the oil while I am putting it back together? Should I use a syringe to shot a little oil in each part as I put it back together, or add it all to the low side after I get everything back together. I am not using the compressed oil, as I don't think I could acuratly measure the weight of the R134a that needs to be added to the system using the compressed oil mixed with R134a. Since all of these parts have oil in them while being removed, I think it would be safe to add the oil in small amounts to each piece as it goes back together. The Honda Service Manual shows "x" amount of oil for each piece replaced, so it makes since to me, that each piece should get "x" amount of oil going back together, but I could be wrong. What do you guys suggest? I have a vaccum pump and gauges, and know how to add the refrig, I'm just not sure on how to go about adding the oil to a totally dry system.

 

Edit -- As suggested by others below, it's best to just add the proper volume of oil to each part.

 

the ways you said should work fine, there is a procedure in a honda manual about pouring the amount of oil into the compressor alone, it should then pump it throughout the system

 

Evaporator 45cc 1-1/2oz
Condenser 20cc 2/3oz
Lines 10cc 1/3oz
Receiver 10cc 1/3oz

Compressor: On the compressor replacment, subtract the volume of oil drained from the removed compressor from 120cc 4oz, and dtrain the calculated volume of oil from the new compressor. 120cc (4 fl oz) - Volume of removed compressor = draining volume.

This leaves the same mount of oil in the new compressor that was in the old one...

 

put it in on the high side so it is forced through the sys if you put it in on the low side 4oz could hydro lock the compressor and then your back to squre one gasses compress liquid do not .

 

I don't believe anything should ever be added to the high side port. The pressure is too high.

 

you never add oil to a sys that has pressure in it. you add oil first then you charge the sys.

 

most people have forgot this and that is one of the many reason why there is no oil injection on new a/c machines

 

I think you make a very good point, if one is adding straight oil rather than a refrigerant-oil mix to the system. This is also a good argument for just adding the proper volume of oil directly to each component whenever possible.

I pointed this out because it was not mentioned in your post. It's also important to say that the system is under a deep vacuum and the A/C is off when straight oil is added.

 

Oil stays in the system. If your not replacing a component, don't add oil. And don't bother with those injection cans of oil. A $3 bottle of PAG 46 is better and you actually measure the amount your adding to make it correct. Just put the required amount into whatever component your replacing, and close it up. :D

Oil doesn't come out when you vacuum the system. Vacuum only pulls out the freon, air & water. Oil would only come out if you let the system vent rapidly from full pressure.

 

Or a refrigerant leak, which is then tricky to know how much oil has been lost.