The smallest with a green cap on it.
look for the port with the black cap on it, it's the low pressure port.
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.
on the evaporator / dryer
You can add Freon to your 1999 Chevy cooling system through the low pressure port. Connect your Freon bottle to the low pressure port and release the Freon into the system.
The low pressure service port on your Chevrolet K 1500 air conditioning compressor will be the one closest to the front of the engine compartment. The low pressure service port should be labeled.
Follow lines from compressor-Larger line is low pressure--port may be at or around the accumulator/drier by passenger firewall
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.
Not sure what your asking yes you charge from the low pressure port it is the smaller one your hose should not fit on the high pressure side
Larger hose from the compressor
In the low pressure service port, the smaller of the two.
The low pressure port is located on the left side of the car towards the back of the engine compartment. It was a blue cap on it with a capital L.
The low pressure port on any A/C system will be the the line running from the compressor and going into the evaporator in the passengercompartment. The high-pressure port is in the line coming from the condenser in front of the radiator going to the compressor.