Les is correct. The amount of R134a used to charge the system is less
volume than the old R12 due to pressure differences.
If you put more in than is required you stand a good chance of having an AC
system failure.
Buy a gauge, it is cheaper than most, if not all of the AC system parts.
BTW, I suggest that you find the root cause of your AC system's leakage
problem and fix it.
Also, if your system has been open for a while you should consider
replacing your receiver/dryer.
With a system that is open (ie coolant leaked out) your R/D will be shot
and will not function properly.
Then you will not only face replacing the R/D but also the coolant a second
time as well.
Charlie
At 09:15 PM 6/27/05 -0700, Les Noriel wrote:
I'm no AC expert. But doesn't the R134a create more pressure than the
original R12? I've read that you actually put in less volume than if you
were filling with the old stuff.
I imagine then that you should fill to pressure using a gauge rather than by
volume.
-Les
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Darron Schneider
Sent: Sunday, June 26, 2005 3:27 PM
To: [email protected]
Cc: [email protected]
Subject: [a2-16v-list] A/C recharging
My 89 GLI took 3 cans when I converted it to 134a. And you are correct,
there is a minimum pressure to make the compressor engage. Something to
consider, a test gauge costs about as much as a can of 134a; they're really
quite cheap.
Good luck.
----- Original Message -----
> Date: Sat, 25 Jun 2005 15:42:03 -0400
> From: [email protected]
> To: [email protected]
> Subject: [a2-16v-list] A/C recharging
>
> It's hot and humid here in Boston today (mid 90's). My A/C decided to hit
the dust. Any idea how many cans of 134a would be needed to charge it back
up? I added the one can that I had on the shelf and it did not work. I
recall two cans did the trick a few summers ago in my Corrado. Am I correct
in thinking that it needs so much refrigerant to have the compressor kick
in?
>
> Anyhow, I just pulled the Gli out of hibernation since putting it away a
few months ago in favor of the Corrado.
>
> Thanks,
>
> Jim
> 91 Jetta Gli and others...
> http://members.aol.com/jlpawlicki
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