how to remove oil before r34a recharge?

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inetquestion - 26 May 2008 20:17 GMT

If a system has received refrigerant + oil charges over time and will
no longer take a full refrigerant charge because of the accumulation
of oil in the system, how to you remove the oil? Will a vacuum pump
remove any of this as it takes the gas out of the lines?

-Inet

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HLS - 26 May 2008 20:36 GMT

> If a system has received refrigerant + oil charges over time and will
> no longer take a full refrigerant charge because of the accumulation
> of oil in the system, how to you remove the oil? Will a vacuum pump
> remove any of this as it takes the gas out of the lines?

You can remove the compressor and drain it, then flush the AC lines, etc.

You have to do this when you convert a "black death" failure from R12 to
the newest refrigerant.

A vacuum pump wont do it, alone.

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inetquestion - 26 May 2008 22:22 GMT

> > If a system has received refrigerant + oil charges over time and will
> > no longer take a full refrigerant charge because of the accumulation
[quoted text clipped - 7 lines]
>
> A vacuum pump wont do it, alone.

What is involved in flushing the lines once the compressor is
removed? Do you need special equipment to do this, or is it something
you could do in your garage (home garage)?

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Steve W. - 26 May 2008 23:25 GMT

>>> If a system has received refrigerant + oil charges over time and will
>>> no longer take a full refrigerant charge because of the accumulation
[quoted text clipped - 10 lines]
> removed? Do you need special equipment to do this, or is it something
> you could do in your garage (home garage)?

Pull the compressor and drier and orifice tube or any mufflers. Connect
a hose to one end and put it into a container to catch the oil/flush
fluid. Connect the other end to an air powered siphon nozzle, connect up
to CLEAN FILTERED pressurized air, OR use nitrogen. Then stick the
siphon into a container of mineral spirits, or something like Dura 141.
or buy something like these.
http://www.mobilair2000.com/acproducts/acflush.html

Once you flush the system you then need to run your air source through
it and make sure ALL the flushing agent is removed.

Signature

Steve W.

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HLS - 27 May 2008 00:47 GMT

"inetquestion" <inetquestion@hotmail.com> wrote in message
news:6d21e588-d272-4ab5-

> What is involved in flushing the lines once the compressor is
> removed? Do you need special equipment to do this, or is it something
> you could do in your garage (home garage)?

Steve W. already answered it rather well. You dont really have to have a
lot of
special equipment.

I converted the R12 on my 90 Reatta to R134A not so long ago. It was really
dirty. I had to change out the compressor in any case since the old GM pos
was
leaking.

There was a lot of black death in that one.

I bought my new parts from www.ackits.com and had some help from some
friends.

Dont waste time - if you arent going to do it right, save your time and
money.

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