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next move it to check for a bad head gasket or warped or cracked heads.. A leak down test or combustion leak test is helpful in he diagnosis
have you pulled the plugs to look for coolant wash?
not all head gasket failures result in intermix...I would start there
its possible that the radiator is plugged not common but a possibility...
no sensor will cause a overheat... a failed fan clutch would cause a run hot situation
does it have a clutch fan also?
it should do you know how to check?
VISCOUS FAN DRIVEIf the fan assembly free-wheels without drag (the fan blades will revolve more than five turns when spun by hand), replace the fan drive. This spin test must be performed when the engine is cool.For the following test, the cooling system must be in good condition. It also will ensure against excessively high coolant temperature.WARNING: BE SURE THAT THERE IS ADEQUATE FAN BLADE CLEARANCE BEFORE DRILLING.
WARNING: USE EXTREME CAUTION WHEN THE ENGINE IS OPERATING. DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
this is a pic of it
ok so yours just has elec fans..then I would have the heads and head gaskets checked