If you are talking about A/C low pressure side fitting it is located on the passenger side of the car underneath the hood, you will have to look in the back it is a deeper inside.
Follow lines from compressor-Larger line is low pressure--port may be at or around the accumulator/drier by passenger firewall
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 port for a 2005 Chevy Malibu is located on the air conditioning system near the accumulator, which is situated on the passenger side of the engine compartment. You can identify it by its smaller size compared to the high pressure port and typically has a blue or black service cap. Make sure to check the markings on the ports to avoid confusion when servicing the AC system.
Low side service port is against the firewall just underneath the alternator. It has a Blue cap on it.
passengers side about a foot down between firewall and engine!! it has an "L" on the cap.
the low pressure port is on passegers side, between firewall and engine. the cap has an "L" on it.
The low pressure air conditioner port on a 2010 Chevy Malibu is located on the accumulator, which is typically found near the firewall on the passenger side of the engine bay. It is usually a smaller port compared to the high-pressure port and is marked with an "L" or blue cap. To access it, you may need to move some components, but it should be relatively easy to identify. Always ensure the engine is off and the system is not under pressure before attempting to connect or disconnect any lines.
In 2002 the Chevy Malibu had a large port 3100 engine producing around 180hp. This engine was used from 2000 to 2003 in this form.
it is located about half way down in back of engine on passengers side,between engine and firewall.
on passengers side about 1 to2 feet down at firewall, below alternator. this is the low pressure port to recharge a/c.
To recharge the air conditioner in a 2002 Chevy Malibu, first locate the low-pressure service port, which is usually near the accumulator or dryer. Attach a refrigerant can with a gauge to this port, following the instructions on the can for proper use. Start the engine and turn the AC to its maximum setting; then, slowly release the refrigerant into the system while monitoring the pressure gauge. Once the recommended pressure is reached, disconnect the can and replace the port cap.
look for the port with the black cap on it, it's the low pressure port.