That's what i first concluded from readings on the web, yet the hiss of escaping refrigerant suggested otherwise. Unless there's a valve type mechanism on the r/d that engages once the switch has been screwed out far enough. Or the AC shop slapped in some cheapo aftermarket r/d which has no barrier between switch and refrigerant.

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'83 SD, 2x '85 SD
You are entitled to your own opinions, you are not entitled to your own facts.