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on my 97 850 there is no high pressure port only low pressure, and yes the hose will only fit one side. the fittings are different for high and low side.
on your 93 the fitting may be near the back i am not sure. but it should definitly be in a line. and the service hose will only fit the low pressure side. so if the hose fits. that is probably the right fitting.
if you are not sure go to a local garage and ask them to show you. or have them service it for you usually a AC check is like 24.99 plus freon. 3-5 dollars a can for R134!
Dan
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