[Shotimes] Compressor doesn't cycle

[Kenneth Epperly]

Ford doesn't use a high side switch up to 92 for sure. Older hoses are less
likely to leak as they are saturated with oil and are closed more. For a
long life the R12 oil needs to be replaced as it isn't compatible with 134a.

        Ken

Subject: Re: [Shotimes] Compressor doesn't cycle


> Last time I checked on Car A/C units (and many smaller home units) they
are
> pretty simple. There are two pressure switches that continuously open and
> closed based on pressure on the high and low sides of the AC system. If
the
> pressure in the high side is never reaching what that switch is looking
for,
> i.e. orrifice to large, or some other problem, you will GET cooling as the
> compressor runs and circulates the 134a, but the compressor is liable to
run
> all the time because that higher pressure is never reached.
>
> As was stated in the other reply to this post, there SHOULD have been more
to a
> real kit. Then again, I drained and pulled vaccum on a 91 w/ a 3.8, filled
it
> with 134a, and the compressor does run longer, but it DOES cycle.
>
> I seem to remember the low pressure side being between 30 and 50 as the
> compressor cycled and I don't remember what the high side was (I borrowed
a set
> of diagnostic / fill guages).
>
>
> Sorry I couldn't help more...
>
>
> Carl
>
>
>
> Quoting Kevin Galuska <whitegen1sho@hotmail.com>:
>
> > After having the ac system on my '91 evacuated, I charged it with R-134a
.
> > The kit I bought came with a gauge and when I was through with the
process
> > it was read around 30 whatever the standard unit is. I ran the car for
about
> >
> > 10 min afterward and was getting very nice, very cold air out of the
vents.
> > The only problem is that the compressor didn't seem to cycle, it just
stayed
> >
> > engaged the whole time. I have checked the clutch gap and it is in spec.
I
> > know most people have a problem with the system cycling to often, and
was
> > wondering if there is a problem with the system not cycling enough?
> >
> > Kevin
> > whitegen1sho@hotmail.com
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