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Yup, just going off what I've seen and learned. The valve regulates the amount of freon flow to the evap core to keep it from freezing up, if it fails you can get full flow at all times and it can freeze the core up like one of those old time ice box's. The valve has a diaphragm and a tube...

With the drain working and the system blowing very cold air and making the HVAC plenum icy cold, it sounds like the expansion valve has failed and its freezing up the evap core. I've seen them turn into blocks of ice because the valve failed, no regulating and it just freezes right up. Just...

Just a couple of questions since I don't know the old AC systems very well. Did they use some type of expansion valve to control the Freon flow to the evap core? If they did it may be failing and allowing full flow all the time? Did they have drains installed in the HVAC plenum (box) for...

I'm not a radiator expert when it comes to the difference between big and small block engines, I would imagine it would be how many rows of tubes are in the core? Anyway, I have found a local, used (non-leaking) B-body radiator for my coronet and I need to know what to look for to confirm it...