If you have to wait, don't use your A/C at all. It will kill your compressor (if still good).
In the mean time, you will have to switch over the 2-60 A/C system. You do know what that is, right? In case you don't, open 2 windows at 60 miles a hour. Sorry, I could not resist(I'd been there) ;^)

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J.H.
'86 300E