AC DILEMA!!! Please help!

[Tims450SL]

I have a 1986 300 E. It has a AC issue which the complete system has been checked for pressure and for freon.

It doesnt want to get cold, and I have researched and found out a few things- First there is no aux water pump, as it has been by passed as it seems someone has also bypassed the heater core. OK thats no big deal as i would never use the heater (In SFLA).

So there now is a reason why the AC will almost blow cold, when it used to all the time.

Like a dummy one day, I spun the temp wheel to the hot and hit the defroster button for a minute or so. When I spun the wheel back, it would not get cold.

I know it sounds easy and possibly there is a person here who could give me some advise as it is hotter than a hooker in church down here and I just hope any advise is available

Thanks!!!!!!!!!!!