Stop in for a cup of coffee

Morning!
Nother hot day.
Was fighting with the air conditioning in the studebaker yesterday. Could not get it to cool at all. Seems now pressure switch has gone sour. All i want to do is find the leak. First time i tried it, it was cold. Revisit it today. And engine really heats up idling with hood closed. Minor issue, as driving seems to maintain good temp. Thinking louvres in the hood.