Not blowing cold air

Dana67Dart said
In the heater box. Well in your case the heat/ac box.

Also do you have an external valve to shut the water flow to the heater core?, Not sure if that was stock in 68 or 69.

I dont think I have an external valve, if I do I dont know what it is. Are you surprised? Lol.

Heres some pictures of under the hood and my heater/ac box. I need a picture book of this car that has everything labeled. I dont do well with just reading words.