I forgot to say the last work was done by my mechanic, who does nothing but old mercedes. I assume he flushed it all out and rechecked it appropriately. But I am getting tired of paying people for it to not work.
Of course it is a swap to 606 and some of the wrong pressure sensors had been used, and the control unit from a sedan, so it was not straightforward to sort out. But he thought he had all parts back to stock and working. 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
