On Tuesday 11 April 2017 21:37:30 Jon Elson wrote: > On 04/11/2017 12:32 PM, Gene Heskett wrote: > > If you have a slow leak with R-12 in it, putting R-134a in > > it will probably let you hear the leak, its a much smaller > > molecule and can get out of a leak R-12 can't. R-134a also > > operates best at 2-3x the high side pressure R-12 works > > best at. Enough diff I blew the R-12 rated hoses on my old > > gauge kit, and a new R-134a rated kit was cheaper than > > just the hoses. I expect I'll have to charge both rigs > > before the weather gets out of hand in the next month. Cheers, > > Well, the problem is that once these things start to leak, > they will just get worse. Generally, the evaporator has > corrosion due to being wet all the time, and you'll just > keep plugging new leaks. And, plugging a pinhole leak > somewhere in the middle of a (likely) aluminum evaporator > coil without blocking the whole tube might be a complete > exercise frustration. > > Jon > I was referring basically to my 1999 GMC, which I had to convert. R-134a leaves in around 3 years, whereas the OEM charge of R-12 worked well for around 7 years. The 2007 Rav-4 OTOH, is suffering from a worn compressor which while it still has R-134a in it, and I've topped it off once, is not doing much cooling until the engine has about 3 miles of 35mph on it. Needs a compressor according to my gauges, not enough compush left at idle to do any cooling at all. High side pressure could be used as a substitute tachometer. Anything close to a normal high side reading is 4500 rpms.
> ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
