Follow lines from compressor-Larger line is low pressure--port may be at or around the accumulator/drier by passenger firewall
passengers side about a foot down between firewall and engine!! it has an "L" on the cap.
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.
look for the port with the black cap on it, it's the low pressure port.
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.
Low side service port is against the firewall just underneath the alternator. It has a Blue cap on it.
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.
There is a web site www.idqusa.com that will tell you were the low side port is located on a 97 Malibu. Just click on the locate low side port. There is much more helpfull information about your vehicle ac system as well.
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.
I have a 2000 ls,and the low pressure port is on passengers side about a foot or two down between firewall and engine!! down from alternater. it has an (L) on the cap!