64 Barracuda Rebuild of old system Classic Auto Air

Pbiggs,
Well I took off the manifold and all that is in there is a new screen. I think your right on the EPR valve, at least on the units that are divorced, I don't know about married heater boxes....

BUT I did some research and on a stock off the shelf system from that era cycles on and off by a capiliary line from the evaporator to the cool slider switch, I saw this first hand on my unit, and a parts unit that I have. From that cool slider switch with the capilary line is the clutch wire, so that to me makes sense.

NOW, on my unit that was just rebuilt it also has capilary lines on the back side of the high and low lines. With the 134 in it now I guess there is a chance of icing, so, there is a thermo coupler on the high side that has a switch in-line with the clutch to also cycle the clutch to help reduce Icing, I think if it was a married set I wouldnt need it because it would draw warm air to prevent that.

I will take pictures of the whole thing as I go.....