It is the larger of the two, closest to the front of the vehicle the smaller one is closer to the firewall or interior of the vehicle
The 1998 Plymouth Grand Voyager low pressure port can be found on the top of the air conditioner compressor. The low pressure port should be labeled as such.
Under the dash on the driver side.
The 1997 Plymouth Voyager low pressure valve is located on the bottom of the air conditioner compressor. The low pressure valve has a hose connected to it.
Under the hood, along the driver side inner fender panel.
You can find the low side on the a/c compressor or on the low side suction hose...........
you can buy a port on eBay
Plymouth is a port city in England.
leaded gas, plug wire off,clogged catlytic converter,dumping raw gas out of exhaust port.
You can find the refrigerant charge port on top of the air conditioner compressor. The refrigerant charge port will be labeled as the low pressure port.
The obd 1 port is next to the battery
I am assuming you are talking about the A/C. From the compressor, locate the large black hose comming from the A/C compressor. It goes into a small hard line, the valve on this hard line is the low side service port. The hose the comes from the A/C condencer is the high side service port.
It's the same hole as the headphones port.