Chuck:

What an adventure! You did the right thing with the speed sensor, by the way -- won't run if it isn't working.

My mechanic friend always installs a filter in the suction line when replacing a compressor, he's had too many rebuilds rejected under warrenty replacement because of "contamination" -- even if he has replaced all the rest of the system!

I think you have a bad visco clutch, and as a result are running too hot from poor fan performance. Check it next time it gets that hot and you can pull of -- it must stop within one revolution when you shut the engine off. If it spins more that that, the clutch is bad. Do a search for a way to replace the silicone fluid rather than the clutch!

I also wouldn't worry too much about 100C, the cooling system is pressurized to 20 lbs, it won't boil until 120 C or greater.

I would suspect the oil pressure sensor, I'd bet the spring failed. The one on the pan is the low oil level sensor.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!