Ford F150 Pickup. Instruction - part 999

Fig. 19: Disconnecting Block Heater Wire Extension From Block Heater Wiring 
Courtesy of FORD MOTOR CO. 

3. Raise and support the vehicle. For additional information, refer to JACKING & HOISTING .  

4. Disconnect the (A) block heater wiring from the (B) block heater (6A051) and remove. 

 

2003 Ford Pickup F150 

2003 ENGINE Engine Cooling - F150 Pickup

  

Fig. 20: Disconnecting Block Heater Wiring From Block Heater 
Courtesy of FORD MOTOR CO. 

5. Remove the block heater. 

1. Loosen the block heater retaining screw.  

2. Twist and slide the block heater to release the retainer clip and remove. Discard the retainer clip. 

CAUTION: Do not loosen the block heater retaining screw more than 

necessary for removal.

 

2003 Ford Pickup F150 

2003 ENGINE Engine Cooling - F150 Pickup

  

Fig. 21: Removing Block Heater 
Courtesy of FORD MOTOR CO. 

NOTE:

To ease installation, coat the block heater seal and the cylinder block hole 
with grease.

 

2003 Ford Pickup F150 

2003 ENGINE Engine Cooling - F150 Pickup

  

Fig. 22: Installing Block Heater 
Courtesy of FORD MOTOR CO. 

6. To install, reverse the removal procedure.  

THERMOSTAT - 4.2L 

Removal 

1. Partially drain the cooling system. For additional information, refer to COOLING SYSTEM 

DRAINING, FILLING & BLEEDING .  

2. Remove the upper radiator hose.  

3. Remove the water thermostat and paper gasket assembly. 

1. Remove the bolts.  

2. Remove the water outlet connection.  

3. Remove the water thermostat and paper gasket assembly. 

 

2003 Ford Pickup F150 

2003 ENGINE Engine Cooling - F150 Pickup