Folks,
I’m getting the AC on my 83’ 300TD up and running again. When I bought the car, one of the suction lines had a hole, and the system was completely dry. Compressor was worn but not damaged (I’m replacing it anyway).

Today, I flushed everything out with 1.5 gallons of AC flush and my air compressor. The flush was running clear by the time I was done. I then blew the lines out with air.

However, I came back out in a few hours and swabbed the inside of a few lines with a q-tip, and some of them still had a little bit of greasy residue. More prominent in the discharge line.

I could try flushing again, but not sure this stuff will come off without mechanical cleaning.

Any ideas? I’m tempted to just run it, but don’t want to destroy my brand new Delco compressor.

Thanks in advance.