Pontiac Repair: a/c, black caps, pontiac grand am

Question
Wher do I find the valve for recharging my 1997 pontiac grand am Quad 4 aig conditioner. and what color will the cap be.

Answer
Hi, the lines are on the passenger side of the engine, on some car the colors red and blue, and some don't has these colors just black caps, you will have to recharg it from the low pressure side, this will be on the big line, if it has the colors then blue would be the low pressure.