[Shotimes] Retrofitting A/C

[Leigh Smith]

If you intend on keeping the car, I highly recommend a NEW dessicant/dryer
line, and having the system professionally vacuumed out and charged. Without
doing both of the above you will still have some moisture in the system,
which will eventually turn the freon into acids, and eat up the compressor,
evaporator, etc. AKA "black death" or "black goop"
If you have the where withall to vacuum it out yourself, go for it! That's a
very key step.
There are $10 vacuum adapters available, that attach to an air comprressor,
that are noisy but do work.
Lee

----- Original Message ----- 
From: "Jonas Diener" <jdiener@rosettastone.com>
To: <shotimes@autox.team.net>
Sent: Tuesday, June 01, 2004 12:55 AM
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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