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I've done this myself - I used high milage formula recharge containing sealer and a "cooling enhancer" and it works GREAT! My A/C has been ice cold for months now and I hope it will stay that way for at least the rest of the year.
The port is near the windshield washer fluid reservior. If you stand near the WW fluid tank and look down about 8" from the surface of the engine (right beside a belt) you will see a metal pipe with a valve on the top of it. Mine is not marked ('94 850 wagon). It has a cap over it unless that is missing on your car.. remove the cap and attach the hose with can already attached to the port. You have to push down firmly and make sure the hose is not going to pop off. Then start the car, turn A/C on full and leave running for about half an hour.
It's easy!
Good luck...
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