Need to find Low Pressure A?C Port 2001 Impala 3.8

We're can I fine the low pressure cap in a Chevy AC traverse

I have an 02 Impala w/ 3.8L. I'm pretty sure the low pressure port is next to the air filter box. The other port is between the engine and firewall. See picture.

THE LOW PRESSURE LINE IS ALMOST ALWAYS LOCATED ON THE WIDER PIPE OF THE 2 AND SOMETIMES THEY HIDE IT UNDER THE AIR CLEANER ASSEMBLY.

If you are gonna charge Freon, you are looking for the LOW SIDE pressure valve. Most of the time its located on the low pressure hose or the evaporator itself.Look for a HUGE black cap most of the time its that color your freon can if it came with a hose attached will only fit the low side connection.

I have a 2002 Impala 3.8L
There is one port between the air filter box and strut tower (driver's side). I'm pretty sure that's the low pressure port.
The high port is against the firewall behind the engine, about in the middle.
The ports are covered by black caps.

My 200 impala with 3.8L.... the low port is located on the firewall need the red transmission dipstick.
see picture at: http://s2.photobucket.com/albums/y48/ZeeVert/2002%20Impala/ac%20condensor/?action=view&current=P1190272.jpg

PASS SIDE BY THE DRYER NEAR FIRE WALL.

Basic AC system consists of Compressor pump (on engine), Condenser (front grill with radiator) and Evaporator (Firewall). Pump has two ports output (high pressure) and return (low pressure). Follow lines from pump. High side is usually between pump and condenser. Follow lines and find second port this will be low side (refill) port. Paint or replace port caps (red high, blue low). Also, refrigerant in system determines port size (R12 or R34).

It may be located on/near the evaporator case where the big (suction) line comes out.

The low pressure port is located on the passenger side next to the fire wall. It will have a blue cap.