Where is the air condition low pressure port 1997 grand marquis?

Answer 1

subaru ac low pressure fitting locationThe low pressure fitting for filling is what I hope you are looking for.It is located on the aluminum line coming [The larger fitting} into the the rear of the compressor. Vehicles today are sensitve as to level of refridgerant charge.3 to 5 ouces can make the difference in good operation and poor operation.Before it is decided to charge system it is best to make sure that all other ac componets are proper such as both fans up front operational,condenser in front of radiator clean,Hot cold blend door is actually moving all the way to cold.Also the cars cycle the compressor based on temp not pressure outlet temp usually never goes below 45.That sounds cold but when it is 95 out with 90 percent humidity with the sun baking down recirculation will be desired hope this helps

Answer 2

Should be the larger hose from the air compressor Try near the drier at the passenger side firewall