[Shotimes] A/C R12 to R134a Conversion Questions

[Epperly]

Accumulator/ dryer is the only dryer, the liquid line needs to be replaced.
You should flush the system, condenser and evaporator. Best is to drain the
oil and add equal amount of ester based oil as it is tolerant of the R12
oil. Preferred way is to remove the compressor and fill it with the new oil.
Change all "O" rings on the lines. There are kits for this. I was told that
the Ford lines are a different size for the 134a verse 12. all the lines are
aftermarket (FourSeasons and other brands). Its a good 1/2 - 3/4 day job.
The dryer line is easier to remove if you cut it leaving a "L" shaped piece
to twist and pull. The orifice is easier than it looks. The dryer line is
hardest to get back in as it is longer than the space to drop in. Put a
small amount dielectric grease on the "O" rings. You can change the low
pressure switch or use the screw under the plug to change the drop out
point. The conversion kits have the new fittings for the high and low
pressure connections as they are different. remove the shrader valve from
the R12 connections before adding the new ones. The kits that I am talking
about are not those in the discount stores. All they have are "O" rings and
134a fittings.
    This is my take on it, 4 conversions so far, Ken

----- Original Message -----
From: "Heikki Laine" <heikki@heikkilaine.com>
To: "SHOtimes" <shotimes@autox.team.net>
Sent: Wednesday, July 23, 2003 7:58 PM
Subject: [Shotimes] A/C R12 to R134a Conversion Questions


> I am currently collecting parts to repair/convert the A/C in my '93 MTX.
If
> someone has done this and is willing to help me out that would be greatly
> appreciated.  In searching for these parts I came across listings for the
> liquid line and the accumulator/drier.  In most systems I have seen there
is
> a component known as the filter/drier.  Is the filter in the SHO A/C
> incorporated in the accumulator/drier?  Or is there an indepentdent filter
> somewhere that I also need to replace?  Since I am converting to R134a I
> will also need to replace any other parts which are R12 specific.  I read
a
> mention of replacing the orifice, which is part of the liquid line.  Do
the
> liquid lines with the R134a orifice directly replace the liquid lines with
> the R12 orifice?  i.e. Can I simply purchase a liquid line for a '94+ or a
> R134a liquid line for a '93- (if such exists)?  As for the
> accumulator/drier, is this specific to the type of freon that is being
used?
> Are there other parts that are suggested replacements?  I plan to replace
> the o-rings to ensure a good seal.  Can I leave the manifold/discharge as
it
> is?  If anyone has any info that may be helpful please let me know.
Thanks.
>
> -Heikki
> 'hA-kE
>
> Also, is there a "search" function for the archives that I don't know
about?
> Hoping....
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