[Vwdiesel] AC woes

[Nate Wall]

I guess I should say that the manifold guages give a
general indication of the actual refrigerant charge
(volume or weight), since the level in the system is
related to the pressure generated, which is also
relative to the outside humidity and temperature.
Loren is correct, the guages can tell you a whole host
of things about your A/C system's functioning. BTW,
the R-134A and the R-12 guage sets have different
couplers and can only be used with their respective
refrigerants.

--Nate
--- LBaird119 at aol.com wrote:
> > Manifold gages do not give an accurate
> >  indication of charge level.
>
>   Huh???  Guess I've learned and been doing it wrong
> all these years.  ;-)
> There are many things you can ONLY tell with gauges.
>   If the system is over full then the low side line
> will be freezing up all
> the
> way, or nearly all the way to the compressor.  High
> side pressures will
> be on the order of 300 + PSI as well.  Too low and
> the low side drops
> below about 20psi and the compressor kicks out until
> it hits about
> 50 again.  When the high side hits 250 or 270 (can't
> remember which)
> the high speed of the rad. fan will come on.
>   If the expansion valve/screen is plugged or icing
> up then the high side
> will really climb but the low side will drop and
> take a long time to
> equalize.
>   I'd go with the advice of checking bearings,
> alignment and so forth.  If
> pressure's are causing it then I'd mostly expect
> moisture in the system
> so a new receiver/drier might be in order.  I don't
> think these use a
> screen/valve and the regular expansion valves are
> fairly bullet proof
> if they stay dry.
>      Loren
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