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Yes, if you disconnect the coolant temp sensor (CTS) that feeds the ECU then the ECU should command the cooling fan to come on, if the fan doesn't come on then the fan or it's power supply is goosed.
How do you know the fan isn't working?
You need the ECU to be seeing 96' for the fan to come on.
Have you got an OBD2 reader?
The coolant temp you see on this would be the same as the ECU.
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