I had a chance today to do as you said and hooked the car to get some numbers. The numbers and events I received are:
180 degrees F. at the mark that the vehicle normal operates at
at 212-218 degres F. No fans are active
at 223-225 degrees F. The passenger side fans swtiches on
back to 214-216 degrees F. The passenger side fan switches off.
I cycled the temp up and down while parked. The only time the drivers side fan activates is when I have the A/C on. When the engine is around 220 degrees and I turn on the A/C, the passenger fan starts first. Then the drivers side starts about 10 seconds after that.
Does this sound like I need to replace the ECT?
As for the coolant level sensor, I never got around to changing it out at the time when the elbow blew the second time. One of those get it back on the road asap jobs
. It looks fairly simple to change out with just a clip and a pull.