You are going to get a lot of opinions, so here’s mine. I flushed my front and rear evap using a flushing tool on my air compressor. I used shellite as my flushing agent. Flushed back and forth through both evaps. They say you can’t/shouldn’t flush through the TX valve, but I did and many do.
Lot of air afterwards to dry out the shellite.
As for oil, you should use AT LEAST as much as the design says. Your manual will tell you. I used a bit more to be sure. I had about 100ml in the compressor - maybe a bit more - in the sump. I drained it from new, measured how much was in it, then refilled it with the amount I wanted. I then added enough throughout the system to give me at least what was needed, plus I added an extra 30ml I think. It’s meant to be 160ml - I was around 190ml all up. I added some into the condenser, some into pipework.
New, genuine o-rings at any point I opened. New schrader valves on your connectors.
I installed a new compressor, condenser and drier. Had a shop degas and regas.
Getting the compressor out is a battle. I took the front off my D4 and most of the side to get mine out. Didn’t have to remove any suspension components, but did remove the power steering pump.
Good luck!
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
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