AC problem, 92 Bonneville

The AC in my 92 Bonneville is not cooling at all. The clutch does not
engage. Fuses OK, fan working. The pressure is well into the red on the low pressure side, but the compressor in not working of course. About a month ago I charged the system after I let it finish emptying completely. It was leaking through the valve, I replaced it.
Any idea what it may be?
Thank you.

Tony

The car was changed to R-124a a few years ago by an AC shop. I, about a month ago, only let more gas escape to almost empty and refiled it.

I checked three switches including the low pressure one and I think they should be either open or closed. I tested both states on each and it does not cause the clutch to engage. I am not sure if this is a way of testing them.

If I apply a voltage directly to the clutch it will engage and the AC works, cooling the car.

I wonder if it is the thermostatic switch. How can I access it?
Thank yopu,

Tony

hey guess what we have sumthin in common...........................i have a 92 bonny that has no ac either so when i find sumthin out ull find it out(cuz ill tell u)

Good luck