AC question

[r8rs4lf]

1972 Factory AC truck/ NO heat hooked up
Sticker says 134 on compressor

Since I purchased the truck the AC was never really cold. PO said it worked and even added a switch controlled fan to the condenser, but the switch was broken when purchased which he advised me of. Replaced the switch with no results. I had issues with the fan switch as well that I got sorted out.

I went ahead and purchased a low side gauge and a bottle of 134 in case it needed a charge.

Screwed the bottle on the gauge (closed) assembly and hooked up to the low side (blue cap) of the AC. Turned truck on with AC on and fan on high. As I suspected the system was way overcharged. Went ahead and released some, needle moved, but now seems stuck a tad on the yellow just after green. I can get pressure settings later if needed. As I keep capturing the 134, the needle does not move anymore. Should I keep releasing more until I get the needle in the green area? I feel like I have released a significant amount already although when I look in the window of the drier, I still see refrigerant circling.

Not a pro by any stretch, just wanted to see if it could be something simple before taking it to a professional.

All 3 levers are pushed to the left. Like I said there is no heat hooked up as the lines under the hood were cut. I feel a significant amount of air being directed through the vents, just not cold.

Any help?