Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives


FJRIVAS on Sat September 26, 2009 3:04 PM User is offline

Year: 2006
Make: VW
Model: JETTA
Engine Size: 2.0T
Refrigerant Type: R134
Country of Origin: Dominican Republic

Long story short... I am replacing the compressor, condenser, Tx & evaporator of my car.

After some research I found the system capacity:

Refrigerant (R134) 525 g
Oil (PAG) 110 cm3

Couple important notes on the refrigerant oil page:

Note #1

"The quantity of refrigerant oil is in a replacement A/C compressor and equates to the total capacity"

Note #2

"Refrigerant oil is distributed through the refrigerant circuit, which is located in the sump of the compressor before initially switching the air conditioner system as follows:

- A/C compressor approx 50%
- Condenser approx 10%
- Suction hose approx 10%
- Evaporator approx 20%
- Fluid reservoir approx 10% "


-As per note #2, do I need to drain the new compressor and distribute the oil into the different components before initial start up?
-Note #2 makes reference to fluid reservoir... Is that the same as the receiver / dryer ?



Cussboy on Sat September 26, 2009 3:37 PM User is offline

The refrigerant oil will get distributed by running the system. Don't remove stuff to try to "make right", won't matter.

Sounds to me that the fluid reservoir is same as receiver-drier.

mk378 on Sat September 26, 2009 9:09 PM User is offline

Always replace the receiver-drier (fluid reservoir) during any major service. Since you're replacing all the parts except the lines, you will need almost a full charge of new oil. The new compressor should come with notes as to how much oil it contains. Don't trust the oil that comes loaded in a new compressor to be dry. You should drain it out and put in brand new oil from a sealed can, the same amount that came out.

ScotY on Sat October 03, 2009 2:04 AM User is offlineView users profile

This is interesting information. Do compressors have sumps for the oil? I would have thought the oil distribution would have been more spread out but, hey, I don't know much.

NickD on Sat October 03, 2009 5:53 AM User is offline

Key is to get rid of all the old oil, replace full capacity, normally on the high side. If you are really concerned, can pick up your vehicle and shake it before running it. But not really necessary, the act of draining the old or even new oil with a compressor and hand turning the pulley, it's still oil soaked on the inside, it will last the few seconds it takes for the oil to find it's way. Most important is to be sure you have the correct amount of oil in the system.

MikeC5 on Mon October 19, 2009 11:40 AM User is offlineView users profile

I just want to be sure I've got this right. I've rebuilt my compressor (Nippondenso 6 piston) and have flushed the condensor, evaporator and hoses seperately. I'll be putting a new drier in too so I'm not assuming any oil is left in the system. Is it safe to add the total amount of oil called for to the the compressor low side? According to the factory manual, it should have 3.9 oz of oil with the rest going to the other components. If it all (9.5 oz) starts in the compressor can I assume it will properly distribute itself while running? Would it be better to try and add some oil to each component to begin with?

MikeC5 on Tue October 20, 2009 8:04 AM User is offlineView users profile

I'm charging with R-12 if it makes any difference....

HECAT on Tue October 20, 2009 8:38 AM User is offline

The system operates with the oil load distributed throughout the system. I makes sense to distribute the fresh oil within the components of the system to allow for immediate returning lubrication. All of the oil in the compressor or in the suction line could slug the compressor and/or starve it for oil momentarily until it can get back around. Modern compressors will have a very minimal sump capacity, if any.


HECAT: You support the Forum when you consider for your a/c parts.


MikeC5 on Wed October 21, 2009 8:09 AM User is offlineView users profile

That makes sense. I wasn't too keen on the idea of lumping it all into the compressor.

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.