Expansion valve failure?

And now.............yet another annoying story from the old days

After I had swapped a 340 into the old 70 440-6 RR.....the car had had an aftermarket "knee knocker" A/C system, which of course would not fit the 340. ..............Until one day I took the rather large compressor mounting bracket and discovered that a couple of simple mods and some different water pump bolts and spacers---------and it fit!!! And so did the "stack on" crank pulley!!! This system was connected with hose clamps---------from the supplier. I decided to "go for broke" and had stored it with everything pretty well plugged off. So I reinstalled all of it and got the engine bay nice and hot (to help boil off moisture).........not difficult in a San Diego summer...........BUT I HAD NO VACUUM PUMP. R12 was cheap so I bought a few extra cans. I "swept" the system with a couple of cans, then USED ENGINE VACUUM (LOLOL) to evacuate it. I still laugh about this. IT WORKED!!!! The system still worked for several more years until I sold the car