[DML] Re: Back to R12?

["David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>]

The rate of leakage is about the same for either refigerent. You cannot test for leaks with vacuum. It is only about 15 psi negative and you *should* be testing for leaks with the system pressurized to 100 psi. Testing with a vacuum cannot identify leaks, only that you have one or more. Using pressure you can find the actual site of each leak. To convert back you must first find and fix ALL leaks. Next, remove as much of the oil as you can and refill with fresh. You should probably replace the accumulator/dryer. Change the service fittings back to R-12 schrader valves and apply the appropriate stickers. Vacuum the system and recharge. It may not be a leaking hose, it *could* be the seal on the compressor or a fitting. BTW I just put a complete set of John's hoses on my car and it is holding tight so far. His 2 piece hose set-up makes installation easier. Not easy, just easier! It is still tough doing the hoses, accumulator, and especially the orifice tube. I DO NOT recomend casual replacement of the orifice tube. It is WAY too easy to damage the aluminum pipe on the evaporator core and then after you pull your hair out you will be pulling out the dash to replace the thing! If your system is clean inside leave the orifice tube alone. ALWAYS use 2 wrenches to break your fittings loose. The aluminum fittings and pipes can't take much abuse. Flare type wrenches are best if you have them in these big sizes but open ends will work fine if you are careful. Lubricate the fittings, the threads, and "O" rings liberally with refigerent oil before reassembly.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote:
>
> Andy, 
> I have no reports back on the new Goodyear hoses I sell of them leaching and
> I think this is my 4th year in selling them.
> John Hervey
> www.specialtauto.com
> 
> 
> 
> -----Original Message-----
> From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
> Soma576@...
> Sent: Saturday, April 18, 2009 12:05 PM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: [DML] Back to R12?
> 
> Group,
> 
> A few years ago I had a leak in my AC which was repaired, then had the
> system refilled with R134.  The oil was changed, new fittings installed, and
> system vacuumed for over an hour.  The thing is, I have to refill every year
> to two because the hoses leach 134 over time.  I am considering going back
> to R12.  Has anyone done this after switching once?  Any dangers or tips? 
> 
> My system always holds good vacuum, I think its just the smaller 134
> molecules leak through the long hoses. 
> 
> Thanks,
> Andy 
> Sent from my BlackBerryR wireless handheld
> 
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