PeachParts Mercedes-Benz Forum - View Single Post - A/C compressor making funny sound now. . .

dmorrison · #3 08-14-2005, 01:24 PM

Quote:

Originally Posted by ensignthomas

I have a 88 560SEL. I converted to 134 about two weeks ago. The conversion was done by a guy that knows his stuff I believe. He put in the Ester oil to make sure the different oils within the system mix decently. .

Well if he did not flush the system to completely remove the mineral oil, he does not know what he is doing. The mineral oil for the R12 and the ester oil for the R134 do not mix and cause neither to stay in suspension. This causes a lack of lubrication to the compressor. He did the conversion wrong.
If he is a licensed (609) AC service mechanic then have him do the job right.
But by what you have told us, assuming he did not flush all hoses and replace the reciever dryer, then I would not trust him.
If the system was not flushed, it MUST be flushed now to remove the 2 oils in the system. All hoses disconnected and flushed. The reciever/dryer replaced ( anytime the system is opened its a good idea) and the expansion valve replaced if not R134 compatable.

But why did you convert????? If the system had failed then OK but if it was just low then R12 would have been better.

We need more info.

Dave