Open the hood. The ports are under the cowl, on the passenger side, up near the firewall. You can see them thru the vents in the cowl. To lift up the cowl you have to remove the weatherstripping, at least a few feet to allow lifting up the cowl. They're right there.
The low pressure port for the 2003 sable is on the passenger side of the engine compartment. It is right at the firewall made into a hose.
You can find the air conditioning low pressure charging port on top of the air conditioning compressor. The low pressure port will be on the right hand side of the air conditioning compressor.
The low pressure air conditioner port can be found on the top of the air conditioner compressor. The low pressure port should be labeled as such.
Under the hood
You can recharge your 2003 Kia air conditioning system through the low pressure port. Connect your Freon bottle to the low pressure port. Release the Freon into the system.
Where is the low pressure side AC port on 2006 jetta 1.9 TDIRead more: Where_is_the_low_pressure_side_AC_port_on_2003_jetta_1.9_TDI
The high pressure fitting is the larger of the two. The adapters and fittings used to add refrigerant can only fit the low pressure side. I have a 2003 Silverado 2500HD and the low pressure port is just above the accumulator/ dryer on a line that attaches to the fire wall.
You can recharge your air conditioning system by putting Freon into the low pressure port. The low pressure port can be found on top of the air conditioning compressor.
It's located right on the evaporator
2, a high and a low pressure port
The low pressure service port which should be located on the receiver/dryer.
look for the port with the black cap on it, it's the low pressure port.