Ferrari Mailing List: Re: A/C R134a pressures

[Rick Lindsay (rolindsay]

Thanks to all for the advice.  Tonight I added a few more oz. of R134a to my 
car bringing the low-side pressure up to 45 pounds at idle.  Ambient temp of 
about 90 degrees F.  I then took the car for a drive and the A/C was acceptably 
cool.  I think I will insert a thermometer in the evaporator vent, start the 
system, then begin adding R134a again while observing the temp.  I will stop 
once the temperature bottoms out or 55psi is reached - whichever occurs first.

  Progress is good.
   
  rick
  
Milton Souza <milton [at] swcomp.com> wrote:
  Rick,

At 90F ambient temperature, the low side should be 45-55 psi, and the high
side should be 250-270 psi. This applies only for an R134a system.


Milton Souza
Southwest Computer Consultant
Farmington, New Mexico
www.swcomp.com
milton [at] swcomp.com
Office (505) 320-1710 Fax (505) 324-1789

-----Original Message-----
From: Rick Lindsay [mailto:rolindsay [at] yahoo.com] 
Sent: Monday, August 28, 2006 2:25 PM
To: Milton Souza
Cc: The FerrariList
Subject: [Ferrari] A/C R134a pressures

Hello Troopers,
What pressures should one expect for the low and high sides of a R134a
converted 308 A/C system? I know that changes with ambient temperature too.
Your advice?
I charged my system last weekend. The low-side charged up to 45psi,
engine running and A/C on high, at 90+ degrees ambient. I did not measure
the high-side pressure.
Advice?

Rick 
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