Avalanche a/c

I have poor performance/slow cool down on my 2003 Avalanche. I have decent pressure readings but was told it could be a clogged orifice tube. What do you think and where is the orifice located?

I have poor performance/slow cool down on my 2003 Avalanche. I have decent pressure readings but was told it could be a clogged orifice tube. What do you think and where is the orifice located?

What are your low and high idle pressure readings at idle and at 2K rpm with compressor running?
And vent tempture readings on road?

Plugged orifice tube usually throws off pressure readings.

I have saw some with a low charge or air in system and still give farily good pressure readings.
I would pump it down and run vacuum pump on it and add set charge and see what it does.