RE: [DMCForum] Accumulator located
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RE: [DMCForum] Accumulator located
- From: "Scott Mueller" <scott.a.mueller@xxxxxxxxx>
- Date: Wed, 21 Apr 2004 19:38:42 -0500
The rest pressure in my AC system is about 50 psig.
Watch the gauges when your system is operating, it is greater that
atmospheric.
Scott
-----Original Message-----
From: timnagin [mailto:timnagin@xxxxxxxxxxxxxx]
Sent: Wednesday, April 21, 2004 7:14 PM
To: DMCForum@xxxxxxxxxxxxxxx
Subject: RE: [DMCForum] Accumulator located
><SNIP>
>I think it would be a bad idea to try to drive the car with
>a vacuum pulled in the a/c system. The ports in the system
>are sealed with schrader valves which basically only hold
>pressure in. They do not hold pressure out. Hence, if you
>have a vacuum in the system and expose a schrader to
>atmospheric air then it will pull it in. To avoid this
>problem, charge the system before you disconnect the hoses.
>
>Walt
I thought the system always operated below atmospheric pressure even after
the refrigerant was introduced following the vacuuming. I don't see how a
schrader valve would let any outside atmosphere in, unless it was defective,
due to its design.
If you open a charged system then you will see the refrigerant gas escape,
but that is due to displacement caused by the atmosphere rushing in until
they equalize, right?
On a side note, someone I knew in the air conditioning business long ago
told me what he thought was the best way to recharge a system, and he was
damn picky. He would vacuum the system for as long as the specification
required, then he would shoot a little Freon in, then vacuum it again.
Repeating this process a few times before finally filling the system. He
did this on a few of my vehicles and it made a noticeable difference in
cooling.
Greg
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