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!!!!!!!!!!!