[Shotimes] Retrofitting A/C

[Steve Weinrich]

Systems that have been converted to R134a typically take about 80-85% of the
rated R-12 charge.  If an R12 system took 2.25 lbs, it would likely only
require 1.8 - 1.9 lbs of R134a.

Typical oil charge is 5-7 oz of oil assuming all oil was removed .

Steve
----- Original Message -----
From: "Christina Casselton" <ChrisCass@pacbell.net>
To: "'Paul L Fisher'" <sho@paul-fisher.com>; "'Jonas Diener'"
<jdiener@rosettastone.com>; <shotimes@autox.team.net>
Sent: Wednesday, June 02, 2004 7:16 AM
Subject: RE: [Shotimes] Retrofitting A/C


> Jonas--My Helms manual for the '94 which came with R134a, states the
> refrigerant capacity is 31 to 33 ounces or 0.879 to 9.936 kg.
>
> Hope this helps.
>
> Christina
>
> Also, I agree with Paul--a "used" drier is probably a "wet" drier--not
> worth trusting IMHO considering you'd have to recharge your system if it
> didn't work.
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net
> [mailto:shotimes-admin@autox.team.net] On Behalf Of Paul L Fisher
> Sent: Wednesday, June 02, 2004 4:29 AM
> To: 'Jonas Diener'; shotimes@autox.team.net
> Subject: RE: [Shotimes] Retrofitting A/C
>
>
> A new (used) drier is no good. The drier has a desiccant bag inside it
> and absorbs moisture as soon as it is exposed to outside air. That
> means, if it is allowed to see outside air for more than a week (depends
> on the humidity), the desiccant bag is used up. That is the one piece I
> would buy new. When you get a new one, you will notice both ends are
> capped. I would not uncap them until just before install and I would not
> install until just before I had it professionally vacuumed and put the
> Freon in.
>
> There should be a notation on a sticker under the hood as to how much
> oil/Freon to put in.
>
> As to actually charging it, you have to pull a vacuum 1st.
>
>
> Paul L Fisher
>
> '99 Ford Taurus SHO Toreador Red Clearcoat Metallic 66K - Kirk'ed
> 2/29/04
>
>  - Amsoil Two-Stage Air Filter - TS-124
>
> SHO Club member http://www.shoclub.com/
> Check out my web site http://www.paul-fisher.com/
> Amsoil dealer http://www.paul-fisher.com/oil.htm
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net
> [mailto:shotimes-admin@autox.team.net]
> On Behalf Of Jonas Diener
> Sent: Monday, May 31, 2004 11:55 PM
> To: shotimes@autox.team.net
> Subject: [Shotimes] Retrofitting A/C
>
> I have a '92 MTX that had a non-working A/C when I bought it.  For
> some reason I can't fathom, one of the previous owners hacksawed a
> section out of the upper line leading to the evaporator.
>
> Also, shortly after I got it, the compressor seized up.  I had
> removed the compressor and been running the alternator on a short
> belt.
>
> Now I'm trying to get the system working again using 134a.  Maybe I
> should mention that this is my first time doing any type of A/C work
> on a car.
>
> I bought a new (used) compressor, and a new (used) upper line/dryer
> that had previously been used with 134a.
>
> I also wound up having to replace the evaporator with a new one due
> to a one of the stems snapping off in my hand whilst removing the
> line.  Quite a PITA, but I got it done. Did the heater core at the
> same time.
>
> Anyhoo, I flushed out the rest of the lines and the condensor with
> methanol, installed all new green 134a-type o-rings, and put the
> system back together.
>
> Now it's time to charge it.  I have 4 12 oz cans of 134a, 12 oz of
> ester oil, and a cheapie "EZ-Chill" gauge/charging tool.
>
> Though I've looked all over, I can't find the specifications anywhere
> that say how much oil and refrigerant to put in to the system.  Does
> anyone know, or know where or find them?
>
> I understand that when converting from R12 to 134a, one should
> determine the specified amount of R12, and add 80% of that amount of
> 134a, and to use the same amount of oil as specified for R12.
>
> Also, I understand I am supposed to hook the charging tool to the
> charging port on the "low side".  I am not sure which port this is.
> I see two -- One near the condenser towards the front of the car, and
> one on the large line next to the firewall that connects to the upper
> stem of the evaporator.
>
> I have 134a port fitting adapters.
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