Old Pete A/C

[Nostalgic]

With 5+ years of no use, my advice would be to replace the it all - compressor, evaps, and condenser. You can flush and flush, but you'll never get all of the crud out, and will be eating compressors as the crap moves through the system. I have tried too many times to do it on older vehicles that sat after losing a compressor or other component, and have never had a good outcome when trying to do it on the cheap. The only time conversions seem to work out is if it's a functioning system that just lost a single component recently. The only way I would even consider it is if yours still is holding at least half a charge.