The high side is located in the engine compartment, passenger side aginst the firewall. The low side is trickier. it is located on the passenger side of the engine compartment in the front by the headlamps. Easiest way to get to it is to have a lift handy. If lift not available be ready to contort your arm up behind the headlamps.
SOURCE: Can I recharge the AC on my 1997 grand prix my
Yes, you can get a can of freon that has a blue hose with it, R134A freon. Look for the ac line in the engine compartment that has a blue cap on it, (the smaller line), not the red cap. Just push the connector on the hose on to the connection on the line. Have the car idling with all windows closed and the ac on at full blast. Do not turn can upside down or the liquid will flow into the system. While it is charging, shake the can every few minutes, or read the instructions on the can.
The best can to get is the one that has a small guage attached along with the blue hose.
SOURCE: 97 grand am low pressure port to recharge
The low pressure port is on the compressor on the bottom side. It should have a black cap on it.
SOURCE: I need to specifically know
Not sure what year your car is but on 2004's the low side is low behind the engine on the pax side. Near the alternator.
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