Thanks for all the ideas. There is a thread on pelican about it also. Air in the system, low airflow thru condensor were two ideas.
I don't know whether fans were on. I doubt it actually, because it is loud, so Iwould hAve heard it. I will try it again and look. I only used the ac once. My main fan has no shroud, so maybe I need to go electric SPAL there also. Condenser plugged is possible. But why would it work great for awhile then quit? I would think it would not cool well at all. The tank is old. Pressure switches are new. Expansion valve and drier and evaporator and pressure hose are new. Compressors have been rebuilds. Last one from rock auto. Ambient was only in the 80s. Will follow up. On May 23, 2017 11:44 PM, "archer75--- via Mercedes" <mercedes@okiebenz.com> wrote: > > Karl Wittnebel wrote: > > Pressure goes super high, then the compressor fails. It will cool for > about > > 30-40 minutes per compressor. Has new evaporator, new expansion valve new > > drier, now on compressor #3 (or about to be). Control unit is new. At > least > > one new pressure hose. All the vac pods are new, as is the dash. Works > > great for awhile, then gradually gets warmer over an hour or so, and > that's > > it. > > Any ideas on how to troubleshoot this further? Tired of throwing > > compressors at it. Nippodenso units from rock auto, same as original. Of > > course the motor is a 606 now. > > Thanks > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Has the AC auxiliary fan been coming on? > > Did you disconnect all the lines and wash, then blow, them out using AC > solvent from NAPA or elsewhere in the opposite direction from their > direction of flow? > > Did you replace the main freon filter/reservoir? > > Do you have a set of AC gauges (about $60 at HF)?. If so, what were the > readings when the AC was not working properly? (Carefully learn how the > gauges work so you don't accidentally send high pressure into low pressure > cans of freon and/or the low pressure gauges, which could be very injurious > or fatal). > > Which lubricant did you use when you replaced compressors, etc? Did you > add the specified amount? > > Did you add the freon with the can upright or inverted? > > If you added the freon using the typical low pressure gauge that comes > with some cans of freon, what was the pressure reading when you finished? > > Did you have a household or shop fan blowing through the radiator and > condenser when you added the freon? Did you have the AC set on max cool and > max fan speed? > > What has the temperature been where you live? > > There is supposed to an (add-on?) filter that can be installed in the > return line just before the compressor, but I've never heard any discussion > about it on this list, or have seen it listed anywhere. Also, I have no > idea where it would be installed without cutting the return line. This is > supposed to keep the shedded debris from old freon lines from getting in to > the AC pump and other parts. > > Which car is this? All my experience has been with an '83 300D and '83 > 240D. > > Most FLAPS have a book on auto AC repair which should give you the correct > amounts of freon and oil to add. The different types of oils should not be > mixed > (see the book for a discussion of that.) > > It's 2 am here in Florida. Later this AM someone with more knowledge than > I should be able to help you. > Good luck, > Gerry > > > > --- > This email has been checked for viruses by AVG. > http://www.avg.com > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
