the low service port is on the a/c pump

the window is on the top of that black bottle you found with the high service port. it should be a little sight glass a little smaller in size than a dime. if you have truck running with a/c on, you should see stuff moving through the glass as the system cycles.

97 Montero SR w/Mitsu Adj Shocks & Rear Diff Lock ARB Front Diff Lock 4.9 Ring/Pinion 3.15 transfer box 43:1 crawl ratio 2" suspen lift 2" body lift 2" Gas Tank Lift 35x12.5 MTRs 15x10 Wheels Rock Sliderz ARB front bumper w/12k winch Custom rear bumper