Keep the fan inside your 87-93 Fox Mustang blowing properly with this replacement Blower Fan Speed Switch from LatemodelRestoration.com. This is a blower fan speed switch for your 1987-1993 Mustang LX, GT or Cobra. This part controls how hard your A/C blows through the vents. It is controlled by the blower knob on the dash. These will sometimes go bad leaving your A/C blowing too hard or not at all.