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Eric
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 30306
Experience:  Automotive Repair Shop Manager, Technician
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how do I change the heater Blower Motor on a 1977 Ford F25

This answer was rated:

how do I change the heater Blower Motor on a 1977 Ford F250?
HI,

With or without AC?
Customer: replied 3 years ago.

Without AC.

HI,

here are directions:

1977-79 Standard Heater, Without Air Conditioning
  1. Disconnect the temperature and function control Bowden cables from the heater housing. This must be done to prevent damage to the cables.
  2. Disconnect the wires from the blower resistor.
  3. Remove five screws attaching the air inlet (vent) duct to the heater housing.
  4. Disconnect the blower wires.
  5. Drain the radiator and remove the heater hoses from the heater core.
  6. Remove three heater stud retaining nuts and remove heater.
  7. Remove gasket between the heater hose ends and the dash panel at core tubes.
  8. Remove two screws and two nuts attaching blower to heater.
  9. Remove blower fan from motor shaft, and remove motor from mounting plate.

To install:
  1. Install new motor on mounting plate and install blower fan on motor shaft.
  2. Install blower and motor in heater.
  3. Position heater assembly in vehicle and install three stud retaining nuts.
  4. Connect heater hoses to heater core and fill radiator.
  5. Connect blower motor wires.
  6. Place defroster nozzle on heater so that the defroster and heater openings are in the up position and there is no air leak around the seal.
  7. Install air inlet (vent) duct to heater. Plush duct firmly against seal on side cowl and tighten five attaching screws.
  8. Connect wires in blower motor resistor.
  9. Connect temperature and function control cables to heater, and adjust the cables.
  10. Reinstall gasket between the heater hose ends and the dash panel at core ends.
  11. Fill cooling system.

Click image to see an enlarged view

Fig. Fig. : Defroster duct attachment at heater plenum - 1976-79



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Fig. Fig. : Heater installation, 1976-79



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Fig. Fig. : Heater attaching stud locations, 1976-79



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