R134 also has a lower working vpressure than does R12 so don't just go tossing cans of R134a in there willy nilly .
-Nate
Max wrote :
On Fri, Apr 8, 2016 at 4:25 PM, 'Mark in Lakewood, CO' beeser750@... [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:
I'm assuming you're recharging with R-134a. R-134a is a much smaller molecule than R-12, or atmospheric air, so if there's a place for it to escape, it will.20-years ago, when doing conversions from 12 to 134a was at it's peak, some supplier (I can't remember who. Advertised in "The Star", among other places) sold a kit that included not only refrigerant, connector adaptors, PAG oil, etc, but also "barrier hoses", the claim being that the stock hoses in R-12 systems used in W116, 123 and 126 cars would leach out R-134a. I've also seen evaporators that developed pinholes that would leak R-134a, but not R-12.30-years ago, before yards were required to remove the refrigerants, it was not uncommon to come across then 15-, 20-year-old-cars with a full charge of R-12 still in their systems. If you loosened a connection, or broke or cut a hose, you were in for a surprise...!Mark in Centennial, CO
From: "Max temple jasperezra@... [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Sunday, April 3, 2016 10:31:41 AM
Subject: Re: [diesel_mercedes] Two Steps Forward , One Step back......
When you guys pull a vacuum on the ac system, how long is needed to see the system seems OK? My neighbor has all that stuff Nate just mentioned, he has taken ac classes, ect.,ect.We have been tru my whole system, the vacuum reads good for as long as we can wait. Fill it up with ac juice, works good for 1 summer. Blah. Leaks out somewhere, old cars . Max P.S. does anyones ac system work year after year with no recharge?On Sat, Apr 2, 2016 at 8:54 AM, vwnate1@... [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:
O.K. , I'll try to not let this message be the size of a 'phone book , it would be if i covered everything this week =8-^ .
It turns out the Uro fan works O.K. (it vibrates at speed) , there's another as of yet undiscovered fault.....
Anyone know where the fan relay is located ? .
Anyway , the horrific noise my Coupe started making the other day turned out to be my brandy new SANDEN AC compressor grinding itself to junk because the guy who install it muffed the job on several levels ~ he left things loose so multiple fasteners fall off as i was driving , he didn't tighten the hose connection to the back of the compressor so all the Freon leaked out and his screwed up the wiring so the compressor was running constantly even in the non AC " EC " mode , the screwed up wiring also meant the high/low pressure safety switch was BY PASSED
so after the Freon was gone , the oil dribbled out bit by bit and the poor compressor ground up due to simple lack of oil.
He also damaged the body a bit and didn't install the new Condensor properly so it was rubbing on the body and one bracket was detached.....
I have much work to do , I am now looking at buying an AC vacuum pump to properly evacuate the system , maybe even a pressure pump to better test it before charging .
There's a whole lot more bad news , let your imagination run wild .
On the positive side of things , I decided whilst I had to car up in the air I might as well replace the aging American made fractional V-Belts with proper Metric news ones , of course I got a mixed pair of alternator belts , one made in Germany , t'other made in CHINA ~ guess how well they're ' matched '
.
On they went after a very small amount of cleaning , this is the good news : in spite of the recent fuel leaks I've had , I am very pleased to see almost ZERO engine oil leaks under neath the car ! this is a happy thing as I've been replacing gaskets and grommets etc. for a while now .
The intake tract had very little oil in it , only on the bottom part , not lightly coated as is common .
I decided to replace the engine shock absorber mounts , the one below the IP was disintegrating (I have a 'photo but my computer suddenly doesn't see it) , The Classic Center now has the kits very affordably and this includes the hardware , nice as the over sized 6 MM hole flat washersd make dandy problem solvers .
Still no HAVC =8-( , lots more other works to do .
-Nate
Posted by: vwnate1@yahoo.com
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