How do you replace heater fan on 1999 GMC Safari?

To replace the heater fan on a 1999 GMC Safari, first disconnect the negative battery cable for safety. Remove the under-dash panel on the passenger side to access the blower motor. Unscrew the blower motor's mounting screws, disconnect the electrical connector, and then remove the motor. Install the new blower motor by reversing the steps, ensuring all connections are secure before reattaching the panel and reconnecting the battery.