Low side service port is against the firewall just underneath the alternator. It has a Blue cap on it.
The AC low side service port on a 1999 Chevy Astro van is located next to the firewall. It is the port that is closest to the evaporator.
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.
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.
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.
The 2003 Chevrolet Malibu OBD 2 port is on lower edge of dash left of steering column
That would be the low pressure service port and it should be located on the receiver/dryer.
between firewall and engine on passengers side,about a foot down. if not it is by right strut tower drivers side. it has a "L" on the cap!!!
The recharge port is on the larger AC pipe
It is behind the alternator almost against the firewall.
On the accumulator.
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.