Low side A/C service port?

[derekw7]

Can anyone tell me where the low side service port for the A/C is on my 1999 (older style) Tahoe? 4 door, 5.7 V8, 4x4. It is under the hood, under the dash, or?

Thanks!

 

[jlinderman]

Its on top of the AC Compressor, under the hood. If you're looking at the motor from the front, its a cylindrical thing on the front top. You will see a rectangular thing on the top rear of the compressor. There are two ports on that sits vertically, and one that sits horizontally. The horizontal one is the low pressure side, the vertical one is the high pressure side.