WHERE IS THIS PORT LOCATED?

THE LOW PRESSURE LINE IS THE LARGER DIAMETER LINE OF THE TWO AC LINES. IT IS THE LINE (SUCTION) THAT ENTERS THE CABIN AT THE FIREWALL SOMEWHERE ON THAT LINE IS THE CHARGING PORT

THE LINES THAT RUN FROM THE AC ARE TWO SIZES. THE SMALLER DIAMETER IS THE HI SIDE. IT RUNS FROM THE COMPRESSOR TO THE CONDENSER. THE LARGER DIAMETER IS THE LOW SIDE AND RUNS TO THE EVAPORATOR INSIDE THE CAR. THE FILLER FOR THE LOW SIDE IS ON THE LARGER LINE. IT WOULD HELP TO KNOW THE CAR IN QUESTION WHICH WASN'T PROVIDED

http://www.reliable-store.com/products/2001-suzuki-xl-7-repair-manual

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Follow the larger diameter pipe below your high pressure valve, between that point and the compressor

Look back on the firewall for the two a/c lines. One is large and on is much smaller. The larger line is the low pressure line. Follow that line back to the compressor. The low pressure port will be on that line.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Freon is allways added to the low-side service port. The service manual does not een mention where the service ports are on your vehicle. The service manual assumes that this is being done by a trained technician who knows how to find the ports.
For help in finding your service ports, go to http://acprocold.com/ There you will find instructional videos and you may also find your vehice in their database with pictures of where your service ports are located

This job requires special tools and special training. If you lack either, you risk SERIOUS personal injury. Injury comes VERY EASILY!

You need to address oil levels, proper and legal refrigerant recovery, system evacuation, and recharge.

You were planning to also replace the receiver/dryer, correct? It also needs the oil in it measured and incorporated into the amount of oil (in %) that would need to be added. FAILURE to address these and other issues will guarantee premature system failure and likely compressor damage.

Take this job to a qualified shop.
Sorry

The low side port of the 2005 GMC savanna Van is located on the low pressure side of the compressor.

This is found by locating the compressor driven by a belt that has a clutch that engages and disengages as the a/c cycles.

The low pressure piping is always in the larger diameter piping, and the high pressure side is always contained in the smaller diameter piping.

Therefore, follow the thick pipes from the compressor up to the accumulator, which looks like a large can of soup. On the accumulator receiver/drier is a port that connects to the tube that is connected to the can of r134a freon refrigerant.

Simply quick connect the tube to the low side port, which is located on the 'thick' tubing or on the accumulator and then fill until the low side pressure is 25 psi to 45 psi while the compressor is running.

When the car is off and the compressor is not running, the pressure should be 75 psi to 100 psi on a hot day.

Hopefully the system doesn't have a leak slow or fast in it.

Hi,
Either on the "dryer" which is the bottle shaped item usually next to the radiator or firewall or on the largest diameter a/c hose, not the smaller diameter. You will feel this hose get cold if you are on the right one. I'm guessing you have a standard recharge kit from Wal-Mart, AutoZone, etc. which consists of a pressure gauge, screw on tap, valve, hose with attached fitting if yours differs let me know before proceeding otherwise, first attach hose to the low pressure charging port on the refrigerant line. This will be on the larger tube usually near or on the accumulator. The silver aluminum cylinder with several wire connections and 2 black plastic covers which will be your quick connect connections the smaller diameter one will be your low pressure side. Be sure to wear gloves and eye protection!!!
Thank you for contacting Fixya.com

There should be two lines/hoses that come from the compressor. If you can locate these lines, the low pressure side is the larger diameter line or hose. The high pressure side is the smaller diameter line/hose. The re-charge goes into the larger, low pressure side.