SOURCE: how do you tell the high side and low side ports
should be a black cap you will know if it's the right one because the fiting will only go on the low port side.
SOURCE: Where is the low pressure ac port on a 1999 GMC
the large ac line is the low pressure side the port is between the compressor and the firewall this is where you charge from
SOURCE: where is the ac lowside port located on a 2005 gmc
The low side port of the 2005 GMC savanna Van is located on the low pressure side of the compressor.
This is found by locating the compressor driven by a belt that has a clutch that engages and disengages as the a/c cycles.
The low pressure piping is always in the larger diameter piping, and the high pressure side is always contained in the smaller diameter piping.
Therefore, follow the thick pipes from the compressor up to the accumulator, which looks like a large can of soup. On the accumulator receiver/drier is a port that connects to the tube that is connected to the can of r134a freon refrigerant.
Simply quick connect the tube to the low side port, which is located on the 'thick' tubing or on the accumulator and then fill until the low side pressure is 25 psi to 45 psi while the compressor is running.
When the car is off and the compressor is not running, the pressure should be 75 psi to 100 psi on a hot day.
Hopefully the system doesn't have a leak slow or fast in it.
SOURCE: which port is the low
The low side port is always the smaller fitting on the larger line. The high side is always the larger fitting on the smaller line. They do this so that the low side fitting can not be mixed up and placed on a high side port.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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