Arthur,

Those two links to the relevant parts are correct.

(a) After checking, the AC has minimal Gas in it.

(b) I will replace the engine temp sensor. Even with the engine over 115 degrees C the resistance to ground remains over 750Kohms on both legs to ground.

Three problems I have:
(1) Engine overheats on idle - Thermostat replaced, New radiator, most likely viscous fan + loose fan belt.
(2) No low speed auxiliary fan
(3) No high speed auxiliary fan

Thanks to Arthur, Items (2) and (3) now look like being cleared up.