Date: Thu, 16 Aug 2007 21:05:13 -0500
Reply-To: Larry Alofs <lalofs@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Larry Alofs <lalofs@GMAIL.COM>
Subject: Re: Update: Is my Compressor Broken?
In-Reply-To: <46C479B0.6040902@cs.uchicago.edu>
Content-Type: text/plain; charset=ISO-8859-1
If you have the proper Bentley circuit diagram, you might be able to work
backward from the compressor and find out why it's not getting 12V. Maybe
the pressure switch is bad or your on/off or thermostat control is at fault.
How did you decide that it needed a whole can of oil?
What type of oil did you use?
Ester oil is best for conversions because it is compatible with the mineral
oil that may remain from the R-12 system. In general it's best to get as
much of the mineral oil out as is practical; if you change compressors, try
to drain the replacement well.
Larry A.
On 8/16/07, Wesley Pegden <wes@cs.uchicago.edu> wrote:
>
> Forgot to add another issue:
> Even with the 2 cans of freeze-12 in there, I still need to jumper the
> compressor to the alternator to get the clutch to engage.
>
> This is all in a 83.5 1.9l camper by the way.
> -Wes
>
> Wesley Pegden wrote:
> > Thanks very much for the help!
> >
> > Of course, I have more problems now...
> >
> > Before I started adding, there was no pressure (totally empty). Just
> > now jumped the compressor and now got 2 12oz cans of freeze-12 in there,
> > along with one of the cans of oil. My new question: although it doesn't
> > sound to bad at idle speed, as I increase the engine speed, at some
> > point (maybe 1500 rpms or so?) the compressor becomes really loud...
> > like something is knocking around in there in a way that it shouldn't
> > be. So, I guess my compressor is broke?
> >
> > Next question:
> > I DO actually have another compressor. The '84 passenger van we haven't
> > sold yet has a compressor in it. It's A/C doesn't work because of
> > electrical issues that I didn't want to bother to fix. That system held
> > it's refrigerant. A year or so ago, I had someone evacuate the r-12 so
> > that I'd be able to remove the compressor. So it should be easy to do a
> > swap now, I guess.
> >
> > So, is there anything should know about swapping compressors? Should I
> > be changing any seals, lubricating, etc., the old compressor I'm going
> > to put in there?
> >
> > Thanks very much for any help, guys.
> > Wes
> >
> >
> >
> >
> >
> >
> > Larry Alofs wrote:
> >
> >> When the clutch is engaged the whole end of the pulley turns, not just
> >> the groove where the belt is.
> >> If the pressure is low enough, the safety switch disables the
> >> compressor to prevent it from running without the proper oil
> >> circulation. Do you have a real gage set so that you can tell what
> >> the pressures are? Usually you can get enough gas to go in at the low
> >> pressure side to get the system to boot up. If not, you may be able
> >> to use a jumper apply 12V directly to the compressor temporarily. Try
> >> to be sure that you don't have a problem with your valve connection
> >> that is stopping the gas from going in.
> >>
> >> Larry A.
> >>
> >>
> >> On 8/15/07, *Wesley Pegden* <wes@cs.uchicago.edu
> >> <mailto:wes@cs.uchicago.edu>> wrote:
> >>
> >> My A/C blows warm. I checked and it's empty. I got a freeze-12
> >> kit to
> >> try filling it up, but it won't take a charge (not even one
> can). I
> >> think the problem is that the clutch isn't engaging? My questions
> >> are:
> >> how do I tell if it's engaging? What do I have to do to force the
> >> clutch
> >> to engage? Etc.
> >>
> >> Thanks very much,
> >> Wes
> >>
> >> This is on an 83.5 1.9l westy
> >>
> >>
> >>
> >
> >
>
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