Expansion valve failure?

I know this is a body forum but have a b body question. Have a 383 in a 66 charger I converted to the original air stage one mopar kit, basically the engine compartment stuff. Had the heater box professionally rebuilt. All in the past 5 years. Out of the blue it started blowing warm air. Hooked up the gauges noticed the readings were the same at 100 on high and low.

Swapped out the compressor- same issue happened. This time the gauges read lower but still even. Here is the weird part. If i let the car sit or i start it first thing in the morning, the a/c blows cool. After the car warms up or i turn it off then back on again it blows warm air.

The expansion valve ices up pretty good when its working, stays room temperture when its not working.


So since I replaced the compressor- the expansion valve is bad?

I have bypassed the heater control valve on the firewall - it was not holding back all of the coolant , i will send out to rebuild

I had the system evacuated and recharged by a professional mechanic with a machine. After i replaced the compressor they put 2.5 pounds in the system.

I brought it back to them to discharge so I could replace the expansion valve- they removed 2 pounds- so my guess is the expansion valve is sticking? there are no leakes in the system - dye and uv light test confirmed that.

anyone else have any suggestions. Plan is to replace the dryer and expansion valve