How do you replace heater fan in 1999 ford contour?

To replace the heater fan in a 1999 Ford Contour, first disconnect the negative battery cable for safety. Remove the glove compartment to access the fan assembly, then disconnect the wiring harness and remove the screws or bolts securing the fan. Carefully pull the old fan out, install the new fan in reverse order, and reconnect the wiring before reassembling the glove compartment. Finally, reconnect the battery cable and test the fan to ensure it operates correctly.