Above the bellhousing at the rear of the engine compartment, almost right above the TXV (or where the two lines enter the cabin). The high pressure is harder to see as it's pointing straight up just behind the air filter housing, above the frame rail.
SOURCE: 97 grand am low pressure port to recharge
The low pressure port is on the compressor on the bottom side. It should have a black cap on it.
SOURCE: low tire pressure light is on all tire pressure is
Turn off the radio and turn the key to the on postion. push the bottom knob ( to turn the station). Hold it in intell the info comes on. in the window it will show all the things you can reset. using the arrows to the right of the knob find tire reset the push on the station knob. this will reset it. then go back to the arrows and find end. push on the knob one more time and you will be done.( you have to make sure the radio is off). I hope this helps.
SOURCE: Need to find Low Pressure A?C Port 2001 Impala 3.8
The low pressure port is against the fire wall, look straight back and you will see it.
Greg
SOURCE: WHERE IS THIS PORT LOCATED?
Yes, on my 2002 xl-7 the low side port is behind the grill as ibass215 says. The cap is light green and marked with an "L". Thanks Susuki, couln't you find a more hidden place?
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