charging A/C oil to add????

[skychair]

I screwed up my 'O' ring on my clutch recycle switch while replacing it.
Went to parts store to pick up a set of 'O' rings to replace. It was late and raining, so didnt restart until this morning.
All of my R134A had evacuated to the driveway.
Pressed the valve in low/hi side of A/C system...nothing, completely empty.
I just vacuumed the system and letting it set to check for leaks.
Now my question, I have heard/read that with a sudden R134A loss you should replace a much as 3 Oz of oil.
This over nite loss, I'm treating as a sudden loss.
Anyone have any input as to how much oil I should replace?????
I'm thinking 2 Oz.
I'll be feeding it thru the Yellow filler hose.

My other question is the amount of R134A to add for 99 Yukon.

I think last time I added 64 oz.
Always seemed like a lot considering the the 2000-2001 was 48 Oz, 2002 was 42 Oz, 2003-2004 was 43 Oz.
All of these are with front and rear air.

Anyone verify the 64 Oz charge?????

Thanks for any assist in advance, Appreciate it.
Ron

 

[PlayingWithTBI]

Check this out - 64oz looks right

https://www.techchoiceparts.com/refrigerant-and-oil-capacities/gmc-light-truck

 

[skychair]

Check this out - 64oz looks right

https://www.techchoiceparts.com/refrigerant-and-oil-capacities/gmc-light-truck

Thanks thought that was right, 64 Oz just seems like a lot.
got any Ideas on the amount of oil to add?
I'm rethinking to 1 Oz cause it was a slow over nite leak.
Appreciate it.
Ron

 

[PlayingWithTBI]

Did you see a lot of oil at the leak? I would put in a can of 134a with PAG 150 (probably 3oz) along with the rest of your charge. You won't get all 3oz out of the can anyway plus, with a system your size I don't think it would hurt any.

Something like this
https://www.ebay.com/p/IDQ-Certifie...arge-Pc3-12-Pack/24025487756?iid=152890113504

 

[skychair]

Didn't notice or look for oil, just a lots of green on the drive way, it was also raining and still is in coastal Georgia.
The leak was high at the recycle switch so I think I may be ok.
Pulled a vacuum and held for an hour at 29+ "
Raining again I left the gauges connected and closed the hood, go at it again in the morning.
If I add any oil at all it will be an ounce or less.
Appreciate your input, Ron