Evac and recharge AC, how much oil is needed?

[i6pwr]

I want to recharge the AC in our 2015 Impala and add some dye. Currently I won't be changing any components, going to have a shop evac the system then I will use my vacuum pump and gauges to recharge the system while adding dye. My question is, how much oil should I add? I assume there will be some in the compressor as well as the lines.

 

[Mechanician]

Unless there was rapid loss of refrigerant, no oil should be needed.

 

[D60]

Some say add an ounce or two for good measure. Typically this is fine unless you know there has been a recent, repeated problem like a chronic leak. Then you add a couple, add a couple more, add a couple more and this isn't great.

IOW everything in moderation.

 

[bdcardinal]

Some say add an ounce or two for good measure. Typically this is fine unless you know there has been a recent, repeated problem like a chronic leak. Then you add a couple, add a couple more, add a couple more and this isn't great.

IOW everything in moderation.

When I replaced the condenser, accumulator and one of the lines on my Silverado we charged the system at work. Guessed about 2 oz per component and then we put on our UV glasses to look at the show on the frame under the air cleaner and guessed maybe 2 or 3 more.

 

[i6pwr]

Thank you.

 

[i6pwr]

So I'm working on this today and here's my question. I had the system evacuated, they pulled 2 oz of oil, I'm also replacing the condenser after the fact. Should I go with 4 oz total?

 

[Timmastertech]

So I'm working on this today and here's my question. I had the system evacuated, they pulled 2 oz of oil, I'm also replacing the condenser after the fact. Should I go with 4 oz total?

2-2.5 ounces. Complete system capacity is 5 ounces on that vehicle, condenser specifies 1 ounce per service manual. The fact that 2 ounces was recovered would generally indicate that the system was overcharged with oil to start with. Thats a lot of oil to recover on a system that holds so little.

 

[Chris142]

Ask the shop how much oil their machine removed. Add that amount and a little more to be safe.

 

[i6pwr]

Ask the shop how much oil their machine removed. Add that amount and a little more to be safe.

They removed 2oz

 

[i6pwr]

2-2.5 ounces. Complete system capacity is 5 ounces on that vehicle, condenser specifies 1 ounce per service manual. The fact that 2 ounces was recovered would generally indicate that the system was overcharged with oil to start with. Thats a lot of oil to recover on a system that holds so little.

Sorry for the double post....

Yeah, that's what I was thinking also....that's alot of oil. I'll go with 2.5oz.

 

[Chris142]

They removed 2oz

Add 3 then pull a vacuum

 

[i6pwr]

Well....I can't believe I did this. Before I started this, I grabbed some freon and oil for when it all went back together. I told the person at the store I had a 2015 Impala and needed the correct oil.

I was given Supercool HFO1234yf Universal 68.

I just realized I need PAG 46....after I added 3 Oz. I removed the lower condenser line and I was able to recover 1.75 Oz.

I didn't start the engine/AC and still at the point where it was added. I added into the high side port and I think some made it down towards the firewall.

So I assume this is not compatible?

I should have triple checked beforehand ..my learning experience.

Is any amount compatible being universal or does it need a flush?

 

[i6pwr]

The good I guess, is I can easily open this connection and the pipe leading down goes into the firewall, and the lower condenser line is that "drain".

 

[i6pwr]

All is good, drained most of it, pulled a vac and refilled with correct oil /134. Been working fine for 3 days with a seperate issue and will do another thread.