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DO NOT USE DYE.....
It will do you no good if the leak is in the evaporator,
it may not do you any good if the leak is on the top side of a fitting..
and it has the potential to gum up something critical like the TXvalve...
Since you are empty... why don't you put a new set of orings into all the places.. then check for leaks.. that way once you are good to go it should last a long time..
The best way I know of to check for leaks is to use four ounces of R22 and nitrogen in your system ... this is APPROVED BY THE EPA for leak finding and you can just vent it when you have found the leaks..
and it leaves no GOOP in your system.
It does require the use of an electronic detector which you may can rent or borrow...
My 81 wagon had a leak in the big hose across the engine AND in the evaporator..
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