If you have a '91-93 Thunderbird or Cougar (and I've heard Ford used this same item on other applications as well) it is a common problem for this module to go bad resulting in no fan or temperature control.
Ford Part # F1SH-19E624-AC
These are located behind the glove box door and they have two screws holding it into the face of the fan housing. There is a 5-pin electrical connection.
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