PAG oil capacity for a134 AC system

[rc51kid]

I found this great thread which has most of my info. I am replacing my evap, drier and condenser with Denso units. Compressor was replaced by PO so i will give it a go. I also replaced all o rings, schrader valves in compressor and big square o ring on the compressor. I removed my compressor and drained all the oil. replaced the parts and filled it with 150cc oil. I figure there is probably about 25cc old oil in my lines and a little left in the compressor. So i should be close to the 225cc factory volume. But i can always add 20cc or so to my drier or whatever.

What do you guys think? Run it as is or add some as i install the new parts?

I just did my wifes Honda system and it shipped with 100% of the oil in the new compressor. So i think that is the standard way to do it. But i also know if you replace just one part you can add some to that one part as well.

 

[Hornd]

Add about a shot to each component then assemble.

Remember to use Mineral oil on the O-rings.
Would get the oil with UV dye in it to ease finding leaks in future.
Make sure you pull sytem under vacuum (to boil off moisture in system) and let sit for 1 hr to ensure hermetically sealed.
If you don't have vacuum pump take to a shop that does.
Make sure they know exactly how much Refrigerant to add. Overfilling is as detrimental as under filling.
Do the drier last as it keeps moisture out of the system especially when open to air.

 

[rc51kid]

thanks. Pulling vacuum now. I have the PAG oil that has dye in it.I think i might have a slow leak still. I pulled vacuum for just a few min and it ran right up to 30 of vacuum. but when i killed the pump and closed the valve vacuum SLOWLY drops to about 25 or 28 then stabilizes. but i bet in 30 min or so it will have dropped some more. I am going to run it for about a hour then turn it off. Should it hold a full 30 vacuum or what numbers for how long is acceptable?

 

[blkprj80]

You should run your pump to full vacuum, then close off the valve(s), then shut off the pump.
If it's tight, you will see very very little needle movement after sitting. You do need to run your pump for a while after it pulls all the way down. Any moisture is still boiling off.

 

[canman]

IIRC, rule of thumb was about 2oz (60cc) of oil in each component when replacing. It that is correct, then you should be ok assuming 60 cc in the lines (225-60 = 165 cc). Don't be too quick to assume a leak as any water in the system will continue to boil off, thus raising the pressure. It will all depend for how long open lines and components were exposed to the air and humidity levels. Normally, you want to pull a good vacuum for at least 45 to an hour to ensure all moisture has been removed.