<VV> Trying again on 134A subsitute question

[corvairduval at cox.net]

Craig is correct. Once you use a replacement refrigerant, you need to have
the system serviced by someone who also uses the same replacement
refrigerant.

Also, ANY refrigerant needs to be installed into a vacuumed system. The air
that is in there in NON-Condensible, and will cause problems. You must
remove the air for it to work properly. You can "get by", but performance
will never be as good as it could be. Plus the air contains to corrosive
elements!

Frank DuVal

Original Message:
-----------------
From: craig nicol nicolcs at aol.com
Date: Thu, 19 Apr 2012 11:06:43 -0700
To: virtualvairs at corvair.org
Subject: Re: <VV> Trying again on 134A subsitute question



Grant wrote: "Trying again. I am shopping for a large canister of 134A and
notice some substitutes such as EcoFreeze that are considerably - up to 50%
- less expensive. Some come with 12 LB in a 30LB canister but are $100
compared to $150 or more for 134A for the same volume. I am checking to see
if anyone has any real life experience with them? Thanks,Grant"

Craig replies: All substitute refrigerants are blends of two, three, or more
"pure" refrigerants. (r-12 and r134a are single component "pure"
refrigerants) These substitute refrigerant combinations, when they are in
the correct proportions, function well. If you are dealing with a system
that has a small leak, or develops a small leak, the lightest component of
the blend is the one that leaks out. When you add more of the substitute,
you're adding not the light fraction that leaked off but instead you're
adding the complete balanced compound. This leaves you out of balance and
performance "inexplicably" suffers.  For this reason, manufactures of
substitutes recommend a complete sweep and refill using a full quantity of
the substitute refrigerant.

Also, recovery equipment handles only "pure" refrigerants (for much the same
reason) so shops reject vehicles with substitute refrigerants - the blend
will corrupt their equipment and tanks rendering them "technically" useless.


For these reasons, I consider substitute refrigerants "false economy" even
though they do work in an A/C system. I recommend "stepping up" to pure
134a. I have used these guys http://www.lenzdist.com/store-closed.php but
for some reason, their website is currently closed. They're in Jacksonville.
Craig Nicol

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