how can i replace my heater fan

Remove the 2 screws from the glove bos striker and take it off. Detach the rear upper glove box panel, then disconnect the wire from the blower and take off the rubber air hose between the blower and housing. Next disconnect the cable fron the case and remove the 3 blower case mounting screws and lower the case. Take out the 3 mounting screws and lift the motor out. If you're putting in a new one, you'll either have to reuse the wheel or buy a new one. Read more: http://wiki.answers.com/Q/How_do_you_replace_a_heater_blower_motor_in_a_1990_Geo_Prizm#ixzz1GMcnu82f