Ford F150 Pickup. Instruction - part 1707

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Install new O-ring seals lubricated in clean PAG oil.  

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Lubricate the refrigerant system with the correct amount of clean PAG oil. Refer to CLIMATE 
CONTROL SYSTEM .  

9. Evacuate, leak test and charge the refrigerant system. Refer to CLIMATE CONTROL SYSTEM . 

 

2003 Ford Pickup F150 

2003 HVAC Air Conditioning - F150 Pickup

  

2003 HVAC

Heating And Ventilation - F150 Pickup 

SPECIFICATIONS 

GENERAL SPECIFICATIONS 

GENERAL SPECIFICATION 

DESCRIPTION AND OPERATION 

HEATING AND VENTILATION 

The heating and defrosting system has the following features: 

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Controls the temperature and, during A/C operation (if equipped), reduces the relative humidity of the air 
inside the vehicle.  

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Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level.  

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Controls the blower motor speed.  

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Cooling or heating can be adjusted to maintain the desired temperature.  

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System uses a reheat method to provide conditioned air to the passenger compartment.  

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The blower motor (19805) draws outside air or recirculated air through the air inlet duct depending on the 
function selected.  

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All airflow from the blower motor passes through the A/C evaporator core (19860), if equipped.  

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The temperature is then regulated by reheating a portion of the air and blending it with the remaining cool 
air to the desired temperature.  

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The temperature blending is varied by the temperature blend 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 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 

Item

Specification

Lubricants
MERPOL(R)

ESE-M99B144-

B

PAG Refrigerant Compressor Oil (R-134a System) F7AZ-19589-DA (Motorcraft YN-
12-C)

WSH-M1C231-

B

 

2003 Ford Pickup F150 

2003 HVAC Heating And Ventilation - F150 Pickup

  

 

2003 Ford Pickup F150 

2003 HVAC Heating And Ventilation - F150 Pickup

  

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. The A/C blower motor has four speeds and is controlled by the blower motor switch and 
resistor (instruction systems) or the EATC module and blower speed controller (EATC systems). 

DIAGNOSIS AND TESTING 

HEATING/DEFROSTING 

Refer to CLIMATE CONTROL SYSTEM . 

REMOVAL AND INSTALLATION 

BLOWER MOTOR 

Removal and Installation 

All vehicles 

1. Remove the RH lower instrument panel insulator. 

Fig. 1: View Of Removing RH Lower Instrument Panel Insulator 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 HVAC Heating And Ventilation - F150 Pickup

  

2. If equipped, remove the dealer installed air filter and brackets.  

3. Remove the passenger side scuff plate. 

Fig. 2: Identifying Passenger Side Scuff Plate 
Courtesy of FORD MOTOR CO. 

4. Remove the passenger side kick panel. 

1. Position aside the weatherstrip.  

2. Remove the passenger side kick panel. 

 

2003 Ford Pickup F150 

2003 HVAC Heating And Ventilation - F150 Pickup