William;
         I too was concerned about high head pressures. I then watched
the gauges as someone else drove around town. The pressures do not get
that high with real air being pushed across the condenser. You also might
have to wait for 100� temps and see what happens.

Drive Safely & Good Luck
Ken Lewis    <Kernersville,NC>
86 VW crewcab;60 356B Coupe
--------------------------------------------------

On Mon, 1 May 2000 20:50:16 -0700 WFryer <william.fryer@WORLDNET.ATT.NET>
writes:
>I'm looking for good information/advice on AC.  I have an '86 Syncro
>with a
>Sanden 510 Compressor (I think that the number - it's the big 5
>cylinder
>one - I know, I had to replace it).  I  just had to replace the main
>high
>pressure hose and get the system flushed and refilled.  Still R-12
>since I
>need the efficiency - I live where it's hot, Las Vegas.  Anyway, the
>AC
>repair place - supposedly the best one in town, is not inclined to put
>the
>full 50.75 oz. of R-12 in called for in Bentley.  First they put in
>about
>2.5 lbs, and today another 6-8 oz.  The uncertainty is due to the way
>they
>measure - they say their eqiupment times the injection length and they
>compute from that, but aren't exactly sure what that gives them.  What
>they
>do do is watch head pressures.  Today, about 80 Fahrenheit ambient,
>the head
>pressure after the addition was 225 psig.  They told me it would
>probably
>get up to 250 psig when temperatures climb over 100.  They say this is
>as
>high as they want to push it.  The previous place had been pushing it
>up to
>300 psig.  Bentley doesn't say.  It works good now, but it always does
>under
>100 degrees.  It's over 100 that it really needs the best efficiency.
>Anybody know the answer??

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