[Arn]

Hello!

Replacing my ac compressor tomorrow. According to the seller it's not pre filled, but they can't say how many ml I should put in it?

This is the compressor I bought

TecDoc

TecDoc Catalogue by TecAlliance - one of the world's leading global vehicle and spare parts catalogues for the automotive aftermarket based on the TecDoc standard.

catalog.mahle-aftermarket.com

 

[Arn]

TecDoc

TecDoc Catalogue by TecAlliance - one of the world's leading global vehicle and spare parts catalogues for the automotive aftermarket based on the TecDoc standard.

catalog.mahle-aftermarket.com

According to that pdf it could be pre filled, but they still want the installer to drain the oil and put the required amount in it.

 

[Arn]

Found this, but it doesn't say total amount

Location of Orifice tube V6

2003 V6. Replacing AC Compressor. Old one locked up. Got a new one along with Orifice tube and Accumulator. For the life of me, I can't find the location of the Orifice tube! Also, I bought some Refrigerant oil. I believe the system holds 8 oz. Should I put half in the new compressor and...

www.passatworld.com

The Bentley has a breakdown of the new oil distribution, 50% compressor, 10% condensor, 10% suction pipe, 20% evaporator, 10% accumulator.

 

[AndreasPassat]

The Bentley Manual says a specific amount of PAG oil to used in ounces (U.S.)
I think it's close to 6 ounces. But I would have to check that.
To get the proper amount of PAG oil the system should fully evacuated and then the PAG oil and R134a introduced into the system with specific amounts.

 

[Arn]

The Bentley Manual says a specific amount of PAG oil to used in ounces (U.S.)
I think it's close to 6 ounces. But I would have to check that.
To get the proper amount of PAG oil the system should fully evacuated and then the PAG oil and R134a introduced into the system with specific amounts.

I have only access to a vacuum pump, is that what you mean by evacuate?

Please check the total amount, would be very kind of you

 

[AndreasPassat]

Straight from Bentley Manual.
So I was off a little bit.
Remember these are the U.S. specs.
You have to know what engine you have, what a/c compressor (note different PAG oils for different compressors - and yes it matters).
The compressor ships with proper amount PAG oil for the whole system. This would be for Genuine VW/Audi spec compressors.
Aftermarket compressors I don't know what the procedure is.

 

[Arn]

Straight from Bentley Manual.
So I was off a little bit.
Remember these are the U.S. specs.
You have to know what engine you have, what a/c compressor (note different PAG oils for different compressors - and yes it matters).
The compressor ships with proper amount PAG oil for the whole system. This would be for Genuine VW/Audi spec compressors.
Aftermarket compressors I don't know what the procedure is.



View attachment 103576

View attachment 103577

Thanks! That's what I needed. I have the correct PAG oil at home.

That's a total of 250 ml in the system and 50% goes into the compressor.

 

[Hirnbeiss]

I have only access to a vacuum pump, is that what you mean by evacuate?

Please check the total amount, would be very kind of you

On a new compressor, you get the oil out before installation by turning I it upside down, so the ports are facing down, then rotate the clutch by hand until all the oil comes out. Catch it in a pan, pour into a beaker to measure and top up as needed. Then you pour it back into the suction port while very slowly rotating the clutch.

Your Danish friends show you here after about 5:45:

 

[Arn]

The compressor was totally dry, we could only get out 1-2ml of oil. So I filled it up with 50% 175ml and uv dye

 

[Arn]

The old had just a touch of uv/oil around it 🙂

 

[AndreasPassat]

The compressor was totally dry, we could only get out 1-2ml of oil. So I filled it up with 50% 175ml and uv dye

I'm confused. Why only 175ml? The book says 250ml.

 

[Arn]

I'm confused. Why only 175ml? The book says 250ml.

The total amount is 250 ml in the system id, but it's devided into this

50% compressor, 10% condensor, 10% suction pipe, 20% evaporator, 10% accumulator.

For compressor 50% of 250 ml is 125 ml.


And I just realized I have filled too much oil in the compressor 175ml instead of 125, god damn. I haven't run it yet, so it's fixable.

Talk about black out.

 

[Arn]

What will happen if I run the compressor with a extra 50 ml oil? I guess it's bad

 

[Arn]

Will see if we can get out 50ml with a oil suction through a port in the compressor, tomorrow.

 

[AndreasPassat]

Your reading into this whole thing all wrong with the system capacity percentages.

This what the system capacity percentage chart means:
As the system is functioning the oil / Freon is flowing through all of the system components, at any given time the percentage of oil in the component is an approximation of said percentage.

The percentage chart is not to be used for gauging how much oil you need to introduce into the system for proper functioning. It is merely used for informational purposes only.

You should be using a full 250cc of PAG oil.

 

[Arn]

Your reading into this whole thing all wrong with the system capacity percentages.

This what the system capacity percentage chart means:
As the system is functioning the oil / Freon is flowing through all of the system components, at any given time the percentage of oil in the component is an approximation of said percentage.

The percentage chart is not to be used for gauging how much oil you need to introduce into the system for proper functioning. It is merely used for informational purposes only.

You should be using a full 250cc of PAG oil.

Are you 100% sure about this?

 

[AndreasPassat]

My previous post was a bit misleading, so let me clarify something here.
You already have an existing system that has been under operational conditions.
In your case the separate component percentage chart does not come into play.
It only applies when the entire a/c system is replaced as a whole.

You need the full 250cc of PAG oil in the compressor. As soon as the system is cycled for the first time after re-assembly the PAG oil will get distributed throughout the whole system.

I'll put my reputation in this forum on the line about this.

 

[Arn]

My previous post was a bit misleading, so let me clarify something here.
You already have an existing system that has been under operational conditions.
In your case the separate component percentage chart does not come into play.
It only applies when the entire a/c system is replaced as a whole.

You need the full 250cc of PAG oil in the compressor. As soon as the system is cycled for the first time after re-assembly the PAG oil will get distributed throughout the whole system.

I'll put my reputation in this forum on the line about this.

You can be right and I can be wrong.

What I have previously been learned is when you are replacing individual components like the compressor, you still have a lot of oil in different parts of the system, not everything is dumped back to the compressor.

So if you fill your compressor to max (factory spec max) with oil without flushing all other oil out you will probably risk having to much oil in the system.

I don't think my vacuum pump will remove the oil that's left in other ac components. But it's a different story if you totally flush or totally replace every part of the AC system, that's my understanding.

So when replacing individual parts it's a guessing game how much oil you have left, but the Bentley manual gives you a rough idea of how much is left.

I should have said this earlier, but it's a -04 B5.5 1.8t.

And if I'm wrong, that's OK then I have learned something new.

 

[Hirnbeiss]

The right answer on a previously filled system is somewhere between 125 and 250 ml. We don’t know how much remains in the other components, but we do know you’re also replacing the dryer (and orifice tube), right? I think you’re fine with the 175.

 

[AndreasPassat]

(grammar)

I just want to add something here. I'm not trying to imply that I'm right and your wrong in an arrogant way. I'm just saying what I know to be true after servicing quite a few a/c systems.
Back in the old days of R12 I used to do all of my own a/c service. But since R134a I've left it to the professionals. I just didn't want to reinvest with all new equipment.
I went through a number of shops before I found a guy that really knew his stuff.
What I've learned from him is the information that I go by as standard.

I will add, when I do any kind of a/c service that has compromised the Freon charge in any way shape or form, I always have it evacuated, vacuum leak tested and then recharged with specified fill quantities. My source for a/c service charges me $120 for the whole shebang. For the 90 minutes or so that it takes, that's really a fair deal in my eyes.

Anyways, in todays world the well equipped shop has an a/c machine that is fully automatic, takes any and all guess work out of the equation.
The only thing it doesn't do is hook itself up to the car.