I had smoke coming from under the hood of my 1985 CA 300D as I pulled into the driveway on a 105 F day after a 16 mile drive home from work. It was coming from the AC compressor clutch. My guess is the refrigerant pressure just got too high, which caused the clutch to slip and all downhill from there as it heats up quick. Same thing happened to our 2002 Chrysler on a 108 F day. My 300D's have only a low-pressure AC pressure switch, so I swapped to a compatible high/low "binary" switch in both. I think my Chrysler has a binary switch, but I installed a little $8 pressure relief valve (~290 psig pop) in a plugged port on the compressor to be safe. Normally, would be illegal to vent refrigerant (R-134A is bad greenhouse gas), but OK for me since I use HC refrigerant in all my vehicles so no worse than a cow fart (actually a major environmental concern).

If the compressor jams, but the clutch bearings are still OK, you can simply pull the clutch relay out to drive home. It is under the black cover on the L inner fender top in my 1984 300D. Not labelled. The other relay is for the radiator fan. In my 1985 CA 300D, you can pull out the Klima relay or unplug the clutch (down in the grub zone).

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans