The yellow wire provides the control reference voltage from the ACC module. It should vary between 3 to 8 VDC (approximate). Red is system voltage. Black is reference ground for regulator as it is mounted in a plastic housing and the regulator controls the fan speed by varying the amount of conduction in the ground leg of the fan. If I am reading your post correctly, it sounds like your blower had seized and your intervention (lube) freed it up. If this is true, and the fuse did not pop, then you may have damage in the ACC module or possibly the regulator (not likely). If the control voltage as measured on the connector behind the vacuum boost can stays at a constant 7 volts, then the odds are your ACC has been damaged. Check all your fuses and retest the voltages. If no change, then I'm betting ACC module.
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.