the transmission doesn't shift gears

Owner: Does the AC work ? If not: Some of the Cadillacs use the same fuse to power the AC compressor Clutch and the Electronic Transmission Solenoids , have seen many non-shifting Cadillacs with these symptoms, if so, the failed fuse may be located under the passenger side dash area, and the AC Compressor Clutch will have to be disconnected for the transmission to operate. * This is just ONE of many possibilities.*