[DML] Re: AC compressor rework

["David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>]

I understand your plan better now but I disagree with some of it. I
agree that you should replace the condenser hose. Once you remove it
you will be able to tell how contaminated your system is. I also agree
that you should replace the accumulator. Your system does not have an
expansion valve. It uses an "Orifice Tube" unless it has been modified
from stock. If the system is contaminated you should replace it. I
still disagree with replacing the compressor. The oil should be
removed and replaced but if it is working (and you say it is) and not
making bad noises, it is probably fine. If you are staying with R-12
you probably do not need to change any of the other hoses. Pressure
test the system and when you refill add leak dye. If you really want
to get the most out of the system use coil cleaner on the evap and
cond coil on the outside fins and tubing. It is taking a big chance
using parts tht are not "right" for the car. Just because a compressor
may look like it is correct on the outside, inside it can be very
different. At least the compressor that is on the car now is correct.
You say it is working so if the only reason you are changing it is
because you can get another one cheap, but has to be modified, I fail
to see the logic.
If you do not have the proper tools, a vacuum pump, gauges, tools,
etc, you should not be messing with the refrigerent. Do the mechanical
work and then take it to a shop for the testing, vacuuming, and
charging. A proper vacuum pump that can get into the micron range is
expensive but you cannot do good work without it. An A/C system should
only be "flushed" if it is contaminated. Usually done with R-11 or
nitrogen.
David Teitelbaum
vin 10757



-- In dmcnews@xxxxxxxxxxxxxxx, "Tom Tait" <TTait@...> wrote:
>
> Thanks David and all.
> 
>  
> 
> I got my A/C working after the car sat basically abandoned for 12 years.
> I've been running freeze12 in my car for the last year or so, but it has
> a slow leak.  I've found that my condenser hose has been spliced, cut, a
> short piece of rigid pipe installed and two hose clamps to reseal it.  I
> can tell from UV dye that I'm leaking a little there, and I may also be
> losing some through the hoses themselves as it turns out freeze12 is
> mostly 134a blended with smaller amounts of other gasses.  I understand
> that 134a will slowly weep out through the older, non barrier type hoses
> as well.  Given the fact that some of the gasses may weep, but not all,
> I realize that any time I add another can of freeze12 (twice a year it
> looks like) I'm possibly changing the blend of gasses, their expansion
> rates, properities, etc. plus I'm just plain leaking a little.  Overall
> it's not an acceptable situation.
> 
>  
> 
> I plan to replace the defective hose, HP hub, my expansion valve and my
> accumulator in coming weeks, and while I was at it I've considered going
> ahead and swapping the compressor as I had a lead on a new one for about
> $40 (one time deal guys, sorry), a fantastic deal made somewhat less
> attractive by the unit having the wrong pulley and back.  Right now my
> unit works fine, but if I'm going to vacuum and refill it, this time
> with my stash of R12,  a fresh compressor wouldn't hurt, especially for
> $40 and some labor.
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