[MR2] reading a/c pressure gauges

[Aaron Bunch]

Look at the PSI. PSI is PSI regardless of R12, R22 or R134. The "scales" you are looking at are temperature estimates based on pressure.

The most accurate way to charge an A/C system is by weight. But you need a really accurate scale (no bathroom jobs). 

Typically we get the low side to about 30 psi and the high to 225. Unplug the temp sensor off the radiator so both fans come on, and have someone (or something) hold the rpm to about 2500.

Aaron

Aaron Bunch    ATS Racing    http://www.atsracing.net
91 2.2 GT35R ATS Turbo MR2 - 607 rwhp @ 34psi
93 SMG Turbo MR2 291 rwhp @ 20.5 psi spare car
07 Tundra DC 5.7

"Just because you have the money to buy one, doesn't mean
you have the skill to drive one."  Steve Neese


--- On Mon, 7/7/08, tbamc <tbamc at gbta.net> wrote:

> From: tbamc <tbamc at gbta.net>
> Subject: [MR2] reading a/c pressure gauges
> To: "MR2" <mr2 at mr2.com>
> Date: Monday, July 7, 2008, 11:58 PM
> I bought a used set of gauges for dealing with my a/c
> system, and 
> thought using them was fairly straightforward.  I then
> noticed that in 
> addition to a PSI scale, there is an R12 and an R22 scale. 
> I 'thought' 
> the large PSI scale was the one to use, but then seeing the
> vastly 
> different R12 scale I started to question that assumption. 
> Anyone know 
> the difference, or have a link to a site explaining it? 
> Google wasn't 
> kind to me.
> 
> Thanks.
> 
> Thon
> 
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