2001 VW Jetta VR6 AC system blowing hot why?

2001 Jetta VR6 blowing hot air why? 1- I did recover and vacuum, blue gage holding at zero and red gage stuck at 150 would not go down to zero but no leaks both hold at place. 2- charged system 4.5oz, AC clutch engaged all time now. Red gage at 320 and blue gage .28 but still hot air no cold. I did recover /... show more 2001 Jetta VR6 blowing hot air why?
1- I did recover and vacuum, blue gage holding at zero and red gage stuck at 150 would not go down to zero but no leaks both hold at place.
2- charged system 4.5oz, AC clutch engaged all time now. Red gage at 320 and blue gage .28 but still hot air no cold.
I did recover / vacuumed / charge three times already same hot sit comes out. The AC switch and knob and cable are fine all fuses are fine, AC compressor working clutch engaged but no cold air.
1- Does this mean I have a clogged hose or clogged expansion valve or what?
2- i even put .02 extra Freon still hot air.
3- is it normal for the red gage to be at 320 psi?
4- why when I recover and vacuumed the red gage gets stuck at 150 does not go down to zero like the blue gage?
5- is the expansion valve attached to the fire wall? Or the compressor?
Any ideas will be appreciated
Update: I am using R134 only
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