<VV> A/C For 69 Corvair

jvhroberts at aol.com jvhroberts at aol.com
Tue Jul 13 16:25:33 EDT 2010

 Also incorrect, ES12 does burn, R12 and R134a are non flammable and non combustible. 

Anytime you change the pressure in the system by any significant amount, nothing is optimized anymore. 


John Roberts


-----Original Message-----
From: Bill H. <gojoe283 at yahoo.com>
To: BobHelt at aol.com; virtualvairs at corvair.org
Sent: Tue, Jul 13, 2010 3:59 pm
Subject: Re: <VV> A/C For 69 Corvair


Bob:  I don't think this is a problem.  The ES12a (hydrocarbon gas) has a higher 

ignition temp than both R12 or R134a, and is non-toxic.  Also, it requires lower 

pressure on the A/C components and less horsepower from the engine to run the 


As I said, I ran it without problems in my other car, and I like the idea that 

it's non-corrosive when contacting moisture...Bill


From: "BobHelt at aol.com" <BobHelt at aol.com>

To: gojoe283 at yahoo.com; virtualvairs at corvair.org

Sent: Tue, July 13, 2010 3:08:01 PM

Subject: Re: <VV> A/C For 69 Corvair

In a message dated 7/13/2010 10:23:01 A.M. US Mountain Standard Time, 

gojoe283 at yahoo.com writes:

The ES12a is non-corrosive if it contacts moisture, therefore no 

>pull-down or vacuuming of the system is needed before charging.  It's legal as 



Isn't Envorosafe propane based? 

And wouldn't that be highly dangerous to use around spark ignition engines?

And wouldn't it be unsafe to use in Corvairs?


Bob Helt



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