It depends on the specific model, but mostly on the passenger side of the vehicle.
Your 2001 VW Jetta low pressure port can be found on the left side of the air conditioning compressor. The low pressure port is for recharging the air conditioning.
The 2001 Chevrolet Impala low side service port can be found on the top of the air conditioner compressor. The port will be labeled as the low pressure port.
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.
Where is the low pressure side AC port on 2006 jetta 1.9 TDIRead more: Where_is_the_low_pressure_side_AC_port_on_2003_jetta_1.9_TDI
In the low side ac service port.
Should be near or on the accumulator.
You can find the location of the service valve where you add refrigerant on a 04 Jetta on this web site alone with very helpfull information www.idqusa.com just click on locate low side port.
The 2002 Volkswagon Jetta OBD 2 port is under dash at left side
back side of engine toward the fire wall.
The EVAP Service port is on the firewall on the passenger side, right next to the low side service port for the A/C.
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.
It should be next to the engine dipstick.