Where do i add refridgent on a sable 2000 - Sable Mercury Cars & Trucks

The low pressure side of the AC unit is the big aluminum pipe coming out of the compressor, it usually runs to the fire wall and goes into the car, But before it does, you will find a little valve, with Green cap and the letter L on it. It is the filler fitting and the only place that the hose will connect. Get one of those bottles from walmart, under $20, has oil and sealer in it, pump it up to 35 lbs, you should be all set, check it in about a week and fill it again, Mine was a junk yard compressor, had no ac for years, put in the comp, pumped it up with less than one 18 oz bottle, been running great all summer. And it is hot down here in FL. Last summer we had none. Yikes.!!! Hope this helps.