Low Pressure Valve 97 Grand Am

Hi, raise the hood , locate the two lines or hoses or whatever you want to call them from the A/C compressor, which is located at the front of the engine, being one of the components with the drive belt going around it, one of the lines is larger than the other, THAT is the Low pressure (or suction side) line, and somewhere along that line there is a small cap that has to be removed to access the recharge valve, the lines come from the compressor up and through the firewall, usually on the right side of the car, when recharging have engine running, A/C on, that line should get cold when working, and for your safety eye protection and gloves.

The low and high side valves are located under the air filterbox, if you open the hood and remove the air filter box you will see the valves ,good day

it is located between the compressor and the accumulator. the quick disconnect valve is smaller than the high pressure valve so you can't make a mistake using the single recharging hose.

The low pressure hose is the fattest of the two.
If need a diagram let me know the engine size .

In order to charge, you must locate the low pressure valve to install the refrigerant. The low pressure valve is between the compressor and the evaporator. Do not charge on the High Pressure side, The high pressure valve is between the compressor and the condenser. To locate the low pressure valve, follow the line that comes from the compressor and routes toward the firewall. The valve will be somewhere on that line. Do not overcharge. The amount of pressure that is needed on the low pressure side will depend on the ambient outside temperature.

Follow the silver a/c lines from your a/c compressor. The low pressure valve has a blue cap and the high pressure valve has a red cap.

sometimes its behind the alternator real close to the firewall. Find the bigger of the two hoses and pipes the low side is always bigger. Also the cap is blue and the fitting for the charging can will only fit on the right valve.

I just found it. you need to go under the car it's just in front of the oil pan. Now Im going to try to recharge it.Wish me luck.

The low pressure port is on the compressor on the bottom side. It should have a black cap on it.

the low side is located on the bottom by the oil filter and the starter hope this helps you out....