The S port is the Suction and its the low side. The D stands for Discharge and its your high side.
the low side pressure port is located just off the back of the compressor, the highside is located in the line on the side of the compressor body
on the back of the compressor
Drivers side, below break fluid resevoir, between compressor and firewall ---See Below--- The low-pressure port usually has a blue or black dust cap and is located on the larger diameter metal tubing that runs between the evaporator (in the dashboard) and the compressor. To locate the low-pressure port: # Find the compressor. # Find large diameter metal tubing that leads from the compressor back to the fire wall. # Find port on this tube. Our quick-connect coupler should fit onto this port. To be sure, compare with the port on the other tube (smaller tube) that leads from the compressor to the condenser near the radiator. This port is larger and is the High Side port. Our quick-connect coupler will NOT fit on the High Side port. # Do not attempt to connect to the high side port as this can cause a can of refrigerant to explode. # Sometimes the low side port is on-or-near the compressor, sometimes it's on an accumulator near the firewall…not on the large diameter metal tube.
The low-pressure port usually has a blue or black dust cap and is located on the larger diameter metal tubing that runs between the evaporator (in the dashboard) and the compressor. To locate the low-pressure port: # Find the compressor. # Find large diameter metal tubing that leads from the compressor back to the fire wall. # Find port on this tube. Our quick-connect coupler should fit onto this port. To be sure, compare with the port on the other tube (smaller tube) that leads from the compressor to the condenser near the radiator. This port is larger and is the High Side port. Our quick-connect coupler will NOT fit on the High Side port. # Do not attempt to connect to the high side port as this can cause a can of refrigerant to explode. # Sometimes the low side port is on-or-near the compressor, sometimes it's on an accumulator near the firewall…not on the large diameter metal tube.
low side port is the one at the compressor
Find the compressor. Find large diameter metal tubing that leads from the compressor back to the fire wall. Find port on this tube. The quick-connect coupler should fit onto this port. To be sure, compare with the port on the other tube (smaller tube) that leads from the compressor to the condenser near the radiator. This port is larger and is the High Side port. The quick-connect coupler will NOT fit on the High Side port. Do not attempt to connect to the high side port as this can cause a can of refrigerant to explode. Sometimes the low side port is on-or-near the compressor, sometimes it’s on an accumulator near the firewall…not on the large diameter metal tube.
The low pressure port (Suction) and the high pressure port (Discharge) are both located on the back side of the compressor.
The low side port is located on the air conditioner compressor. The low side port will be the entry for recharging your air conditioning system.
The low pressure side is located on the compressor. To locate the port, jack up the driver side and crawl underneath to locate the compressor. Add the freon to the port on the compressor.
The Low side line attaches to the compressor on the driver side of compressor. The charging port faced forward. The high pressure port faces up.
The port nearest the firewall on the Drivers side of the vehicle. ---Also See Below--- The low-pressure port usually has a blue or black dust cap and is located on the larger diameter metal tubing that runs between the evaporator (in the dashboard) and the compressor. To locate the low-pressure port: # Find the compressor. # Find large diameter metal tubing that leads from the compressor back to the fire wall. # Find port on this tube. Our quick-connect coupler should fit onto this port. To be sure, compare with the port on the other tube (smaller tube) that leads from the compressor to the condenser near the radiator. This port is larger and is the High Side port. Our quick-connect coupler will NOT fit on the High Side port. # Do not attempt to connect to the high side port as this can cause a can of refrigerant to explode. # Sometimes the low side port is on-or-near the compressor, sometimes it's on an accumulator near the firewall…not on the large diameter metal tube.
if you are referring to the a/c lines just trace the biggest line from the back of your compressor to the fitting and that's your low side port.