If this is similar to the 92 the the low side valve is under the air filter box. Remove the two bolts holding that. It is r134 freon. Add enough so the dryer under the filter box begins sweating. If it leaks out again in less than 3 months you might ought to find the leaking component - tho a can of r134 every three months is tolerable. There is a leak stopper available for small leaks.
Update: Just performed this on my 1998 Chevy Lumina. The valve is still under and behind the air filter box on the driver's side of the vehicle. You can see it without removing the box, but to attach the r134 can, you will almost definitely have to remove the box to have any room to work. There are two valves down there. The low pressure one is the larger diameter metal pipe that is underneath the smaller pipe.
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