JD 6320 ventilating fan question

The fan only works on the two fastest ranges. In the past it did this but one day just came back on. Also in past the fan would not work in any position and come back on the next day or two. It does this both for AC and heat. I checked the switch at least move the connector around with no results. Any ideas what the problem is?
 
Likely a defective resistor in the fan circuit. Under the seat, IIRC, is a bank of resistors that control the fan speed. I think the part was about $30.....
 

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