Its on the suction (low) side hose coming from the accumulator going to the evaporator...
The low side service port for the AC on a 2001 Alero is located on the hose that runs from the accumulator to the compressor. It is the larger of the two hoses coming off the compressor.
The 2002 Chevy Cavalier low side service port can be found on the top of the air conditioner compressor. The low side service port will be labeled as the low pressure port.
the low side port is located in back of the engine on the pass. side just below the fire wall. It is on the narrow matte silver tube against the firewall, it has a blue cap.
You add the refrigerant through the low side service port.
look right by the compressor and condenser
on my 04 alero when you open the hood looking all the way to left sort of under the drive belts there is a blue cap on a wide tube. that is where mine is. it is difficult to recharge yourself....
On a 2002 Ford F-150, the low side AC port is typically located on the accumulator, which is situated on the passenger side of the engine bay, near the firewall. It is a smaller port compared to the high side port and is usually connected to a larger diameter aluminum line. Look for a service port with a plastic cap that is often marked with an "L" for low side.
The A/C low side service port is by the Firewall, just below the Passenger's Side Windshield Wiper Arm.....
should be under the dash board on driver's side
The EVAP Service port is on the firewall on the passenger side, right next to the low side service port for the A/C.
Facing the firewall, its on the left side halfway down the firewall. It has a blue cap.
The low side service port can be found on top of the air conditioner compressor. The low side service port will have a blue top.