Subject: Re: 134a in a 90q system?

[Christopher Ritchie]

>Ester oil works for both R12 and R134,
>so you
>don't have to flush! :-)
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I don't think so.  Check this carefully.  I believe ester is for R-12 only.

There is a bulletin board similiar to this one for automotive air
conditioning.  Go see:  www.aircondition.com

If you're switching from R-12 to R-134a (or vice versa), you want to get as
much of the old oil out as possible.  That requires:

1. removing the compressor to drain it; (Don't flush the compressor.)
2. replacing the receiver/drier; and,
3. flushing the lines.

When you have the compressor and the receiver/drier out, you can more easily
flush those portions of the system that contain the evaporator and the
condensor.  There won't be that much there in the lines anyway.  Most of the
oil lives in the compressor and the receiver/drier.

You really only want to do this once.  Therefore, do it right.  It's really
not that big a deal.  When repairing or switching, you already have the
compressor and the receiver/dryer out.  Flush then.  Vacuum.  Put the right
oil in. Charge.  You're done.

You can switch back to R-12.  You just have to do this same job all over
again, and buy a new receiver/dryer.  Why?  You can buy R-134a at a
reasonable price, and do it yourself.  R-12 is $150+ plus somebody else's
labor each time you recharge.  R-134a is $5/can in the Boston area.

I'm a big believer in switching to R-134a because once you fix all the
things in the A/C system that need fixing anyway, you've done most of the
conversion job.  If you're like me, you almost always need to go back and
fix it again.  R-134a allows me to do that inexpensively.



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