The mineral spirits is the flush. You can buy A/C flush in a can but you will do well if you do as Danny suggested. Basically, you fill each unit with liquid solvent, then blow it out. The idea is to get out particles and old oil.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.