Something unexpected happened that made it impossible to move the car to where I could work on it outside during temperature rises between winter storms.
While driving, I suddenly heard the serpentine belt shredding, but I expected that and had an old spare in the trunk to put on if it completely broke. A few minutes later the engine stopped running. It turned out that the HB and the belt were still barely working, but a belt shred had whipped on sensor wires, which pulled out and mangled a sensor plug, stopping the engine.
This was the upper of the two plugs on the right of the HB. It is a three wire plug that doesn't look like the Vin C four wire plug in http://i38.photobucket.com/albums/e1...n/DSC00613.jpg
Also the Vin C wires appear to have a protective flexible conduit around them, that I don't recall seeing on the Vin 3. What I saw was three exposed gray wires with female pins hanging out of an oval insert body. I couldn't tell if there was a missing plug cover, nor could I see any keyway. If I reconnected the plug pins with the wrong orientation, I might cause more damage.
I decided it was time to throw in the towel, and had the car towed to a shop. Unfortunately, this sensor plug mishap has doubled the professional repair cost.
The pro mechanic told me he had heard of this risk from a shredding belt. Had I known, I would have had enough time to pull over to the side of the road and snip off the belt shred(*) with scissors or knife.
Thanks to everyone for advice. That was an interesting tip about using the starter to break the 220 ft/lb HB bolt free.