Yeah, overcharging will do the same thing. I use a little over 2 lbs R134a in the Benz, so 4.25 for a dual system should be about right. Might try 3 and see what happens, you can always add more if you need it.
Peter -----Original Message----- >From: "Kaleb C. Striplin" <ka...@striplin.net> >Sent: Jul 18, 2010 1:49 PM >To: Mercedes Discussion List <mercedes@okiebenz.com> >Subject: Re: [MBZ] I buy a new AC machine, now have AC problems > >when I rebuilt it last year, I replaced the compressor with a new (not >rebuilt) r4, replaced rear expansion valve, replaced orifice tube in the >front (I dont recall it being pluggd up). I also flushed everything >while it was torn apart. I removed the radiator as well to clean out >the crap between it and the condenser. I am recovering the refrigerant >now and will put in on a vacuum for an hour, then recharge it. See post >just a minute ago. It did run now, but acts like its overcharged or >something. > >Peter Frederick wrote: >> Did you flush the condenser and is it clear of debris between the radiator >> and condenser? Sounds like what my TE does -- high side is too high and >> cooling is inadequate with high pressure, and I'm quite certain the plugged >> up condenser is the problem. If it's too hot from no air flow, the freon >> will not condense properly, so you have both excessive pressure and lousy >> cooling from hot gas instead of liquid at the orifice tube in front. If the >> expansion valve is working correctly, it will be wide open, too, and again >> you get high low side pressure from gas expansion rather than liquid boiling >> -- somewhat less cooling capacity. >> >> You must also evacuate for at least 45 min to remove air and water, >> particularly water, from the system -- R134a oils hold much more water than >> R12 oils, and it takes some time for them to evaporate and migrate out via >> the vacuum pump. >> >> I found that flushing the condenser alone made a huge difference -- if the >> system was ever R12, all the mineral oil will tend to collect in the >> condenser, coating the inside and greatly reducing heat transfer. >> >> Also, was the orifice tube clogged? If it was, did you put a filter in the >> low side hose, and if so, have you replaced it? Slop in there will also >> cause high side excessive pressure, and if the filter is between the fitting >> and the compressor, you can have a vacuum between the filter and the >> compressor and high pressure "upstream" of the filter! >> >> Peter >> >> >> -----Original Message----- >> >>> From: Mitch Haley <m...@voyager.net> >>> Sent: Jul 18, 2010 11:42 AM >>> To: Mercedes Discussion List <mercedes@okiebenz.com> >>> Subject: Re: [MBZ] I buy a new AC machine, now have AC problems >>> >>> Kaleb C. Striplin wrote: >>> >>>> Its R134. got the spec out of the owners manual, there is no sticker >>>> under the hood which is strange. >>>> >>> OK, sight window won't help much then. Was it always R134, or was the 4 1/4 >>> lb >>> the R12 capacity? (remember to use 3/4 as much r134 as r12. >>> >>> If it was working somewhat with 2.x in it and hydrolocks with 4.25 in it, >>> I'm >>> still thinking you want less than 4.25. >>> >>> _______________________________________ >>> http://www.okiebenz.com >>> For new and used parts go to www.okiebenz.com >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >> >> >> _______________________________________ >> http://www.okiebenz.com >> For new and used parts go to www.okiebenz.com >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> > >-- >Kaleb C. Striplin/Claremore, OK > 95 E300, 94 S500, 92 500SEL, 92 300SD, 92 300E 4Matic, > 91 350SDL, 91 300D, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, > 85 190D, 84 190D, 84 300D euro manny, 76 240D, 76 300D, >http://www.okiebenz.com > >_______________________________________ >http://www.okiebenz.com >For new and used parts go to www.okiebenz.com >To search list archives http://www.okiebenz.com/archive/ > >To Unsubscribe or change delivery options go to: >http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
