You did not give the year so I will assume a newer one. The low side fitting is normally on the accumulator. If your system has R134A refrigerant do not use any that has stop leak in it. That will ruin a shops equipment.
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.
What year? look at the accumulator should be near
Its in the biggest line trace it from your a/c compressor.
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 1968 corvette fuse panel is under the drivers lower left side of the dash .
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.
Charged on the low side service port. If you connect a small can of Freon to the high side with the system on, the can may explode from the high pressure introduced into it.....
The low side service port on your 1993 Mitsubishi Eclipse can be found on top of the air conditioner compressor. The low side service port will be labeled as the low pressure port.
The smaller port is the low side.
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 AC service port is located behind the left side of the radiator. On the engine side. You will have to remove the black air tube that is attached to the air filter box to gain access to the service port. The service port will be an aluminum tube with a black cap on it.
There is no high side service port only a low side.