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Pull vacuum and will the oil stay?

StanB on Tue October 09, 2007 11:59 PM User is offline

Year: 2001
Make: VW
Model: Jetta
Engine Size: 1.9
Refrigerant Type: R-12a
Ambient Temp: 90
Country of Origin: United States

I am getting ready to replace the compressor and wanted to clear up last doubts that I had

1. If I pull a deep vacuum for more than an hour with good pump (15 micron) will it suck the oil out in the process?

2. Should I vacuum in cycles, like pull vacuum to 29.5 then close manifold wait 15 min and then run the vacuum again and so on?

3. Total system oil capacity in Jetta is 4 oz, I read that I should add 1/2 to compressor and 1/2 to rcvr/dryer is that correct? Will it stay there if I deep vacuum it?

4. There is no accumulator in Jetta's AC to my knowledge, but there is something that looks like one, can I flush through it ok?

5. Oil flushing the compressor - Do I just pour few oz through suction line?

I would appreciate your help, just wanted to do it right the first time.

Thanks
Stan

TRB on Wed October 10, 2007 12:58 AM User is offlineView users profile

1. If I pull a deep vacuum for more than an hour with good pump (15 micron) will it suck the oil out in the process?

No need to pull a vacuum that long!

2. Should I vacuum in cycles, like pull vacuum to 29.5 then close manifold wait 15 min and then run the vacuum again and so on?

30 minutes let stand for 10 another 30 minutes.

3. Total system oil capacity in Jetta is 4 oz, I read that I should add 1/2 to compressor and 1/2 to rcvr/dryer is that correct? Will it stay there if I deep vacuum it?

System takes more I'll check in the morning. I hate foreign car listings.

4. There is no accumulator in Jetta's AC to my knowledge, but there is something that looks like one, can I flush through it ok?

There is a accumulator/drier on this system and needs to be replaced.

5. Oil flushing the compressor - Do I just pour few oz through suction line?

Yes, and turn the hub a few times to help pump it back out.


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iceman2555 on Wed October 10, 2007 7:10 PM User is offlineView users profile

TRB, read the 'oil balance' article today.....sure sounds like a lot of OE stuff to me.....and also a very good method to insure an overcharge of lubricant in the system...but then if my memory still works....one of the OE's says their FOT system will work with a full system over charge.....mmmmm....lets see....that would be 8+8=16oz of lube...mmmmm...go figure.....no wonder these things keep locking up......oppps....forgot 2nd line......

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

StanB on Wed October 10, 2007 10:09 PM User is offline

Thanks TRB

I got 4oz of oil for the total system capacity for Jetta '01 from NapaCapacityGuide that I have as a PDF file. Please let me know if you have something different.

Let me make sure I got everything right - after everything is flushed I am going to put 2oz of oil in compressor and 2 oz into new drier/rcvr, after that I will pull vacuum for 30 min at a time twice, letting it boil for 10 min. After that the system will be dry as a bone and ready to be charged.

Is that how it goes?

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