'83 240D, auto trans, 216K, all original, everything functioning normally up to this point.

Drove to work, as usual (about 30 miles), pulled in and parked, engine wouldn't shut off/batt light illuminated. After a slight delay (didn't think to time it) engine finally did stop. Thought, "hmmm, that was odd". Nothing like that has ever happened in the past. Got out and went to lock the doors...no go. Locks didn't actuate (no vacuum, apparently).

Went about my normal day, left the car at work til this afternoon (I have a work vehicle). Got in, engine fired right up (as usual), drove home. When I got there, after an uneventful drive, I parked and everything worked normally as far as the shutdown/lock up procedure went. No problem with the power assist on the brakes or shift points with the auto. Everything seemed ok.

Any thoughts? Where to start? Obviously, something leaking in the lock system. Haven't done any "looking/research", yet. Are the locks and engine shutdown on the same leg/source for vacuum supply?

As an aside, also on the way to work that same day, the blower for the heater/ac wouldn't turn on. None of the fan speeds worked. Don't see how that could've been related (but, I've been wrong so many times in the past).
On the way home, today, the blower worked fine on all three speeds.

Figures. Today was my last day at work til the new year. I was all set to change my trans fluid, drain the torque converter, new filter. Also, a couple other minor maintenance tasks over the next few days. Looks like another project has been added to list for me.
Never fails.....