It's located under coolant reservoir.
SOURCE: where is low pressure a/c port on 2005 mazda 3?
Inspect hoses & tubing, larger diameter one is usually low side.
Hi follow the pressure lines from the condenser and you will find the ports, one which is small will be the low side. Let me know how you make out.
SOURCE: can't find low side port for 2000 mazda 626
from compressor trace large diameter line until you see port cap may be marked with L, if a/c is working low side line will be cold or cool, highside will be warm
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Remove two screws from coolant reservoir and you will see it underneath. It does not have an L for low on the cap but it is the only one in that location. You will see that the pipe is thicker than the pipe to the high pressure port, located on the left side by the headlight. This port has an H on it. You can lift the coolant reservoir out of its position to attach hose. For mine I had to push down on the hose connector at the same time as charging the ac.
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