Air Conditioning problem
1995 Pontiac Grand Prix 6 cyl Two Wheel Drive Automatic 132000 miles
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I am looking to re-charge my A/C with commercial off-the-shelf refrigerant, but cannot find any identifying marks on the high and low pressure lines. I have been told that the low pressure line is always the larger tube. Is this true? Also, this model (GTP) car is new to me and it does not seem to have the same type valves (for filling) that I am used to seeing. (air valve type) Are these a special type of valve and will commercial filler type refrigerants with the attached hose work?

yes the low side is the fatter tube and you can buy refrigerant at parts store with a gauge and hose for cheap money.