Ford Mustang Service Manual: Blower Motor

Heating and Defrosting

The heating and defrosting system has the following features:

  • Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle.
  • Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level.
  • Controls the A/C blower motor speed.
  • Cooling or heating can be adjusted to maintain the desired temperature.
  • System uses a reheat method to provide conditioned air to the passenger compartment.
  • The blower motor (19805) draws outside air through the air inlet duct from just below the windshield during all system operations except for MAX A/C cooling (when recirculated air is used).
  • All airflow from the blower motor passes through the A/C evaporator core (19860).
  • The temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • The temperature blending is varied by the air temperature control door, which regulates the amount of air that flows through and around the heater core (18476), where it is then mixed and distributed.

Heater Core

The heater core (18476) consists of fins and tubes arranged to extract heat


The heater core (18476) consists of fins and tubes arranged to extract heat from the engine coolant and transfer it to air passing through the heater core.

Blower Motor

The A/C blower motor (19805 ) pulls air from the air inlet and forces it into


The A/C blower motor (19805 ) pulls air from the air inlet and forces it into the plenum assembly where it is mixed and distributed.

Heater Hoses

NOTE: The heater water hoses connect to the heater core using quick


NOTE: The heater water hoses connect to the heater core using quick disconnect couplers. The couplers are an integral part of the hose assemblies and cannot be separately serviced.

The heater water hoses (18472) provide a flexible connection between the engine and cooling system allowing hot water to travel from the engine to the heater core.

    Heating and Defrosting
    Heating and Defrosting The heating and defrosting system has the following features: Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicl ...

    Evaporator Core Housing
    Heating and Defrosting The heating and defrosting system has the following features: Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicl ...

    Other materials:

    Trailer towing
    WARNING: Do not exceed the GVWR or the GAWR specified on the certification label. WARNING: Towing trailers beyond the maximum recommended gross trailer weight exceeds the limit of your vehicle and could result in engine damage, transmission damage, stru ...

    Pinpoint Test N: DTC B1869 - Air Bag Indicator Inoperative
    Pinpoint Test A: The Air Bag Warning Indicator Is Illuminated Continuously - RCM Disconnected, Inoperative or Lost/Low Ignition Feed Normal Operation NOTE: During normal operation the air bag indicator will be lit continuously for 6 seconds after the ignitio ...

    Interior mirror
    WARNING: Do not adjust the mirror when your vehicle is moving. Note: Do not clean the housing or glass of any mirror with harsh abrasives, fuel or other petroleum or ammonia based cleaning products. You can adjust the interior mirror to your preference. So ...