The blower motor relay location on a 1990 Firebird 6-cylinder is
under the dash, on the driver's side. It's typically part of a larger fuse/relay panel. However, the *exact* location within that panel can vary slightly. You'll likely need to consult a wiring diagram for your specific year and model Firebird to pinpoint it precisely. A Haynes or Chilton repair manual for your car would be a great resource.
Searching online for "1990 Firebird 6 cylinder blower motor relay location" along with images might also yield helpful results showing the fuse box layout. Remember to disconnect the negative battery terminal before working with electrical components.
