Ford F150 Pickup. Manual - part 1815

Fig. 5: Identifying 4R70W Transmission With Auxiliary Transmission Fluid Cooler 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 TRANSMISSIONS Transmission Cooling - F150 Pickup

  

Fig. 6: Identifying 4R100 Transmission With Auxiliary Transmission Fluid Cooler 
Courtesy of FORD MOTOR CO. 

DIAGNOSIS & TESTING 

TRANSMISSION COOLING 

Inspection & Verification 

 

2003 Ford Pickup F150 

2003 TRANSMISSIONS Transmission Cooling - F150 Pickup

  

1. Visually inspect for obvious signs of mechanical damage, incorrect component installation, and system 

leaks. Repair as necessary. 

z

Install a new or remanufactured radiator when fluid is found leaking from the intank transmission 
fluid cooler. Refer to ENGINE COOLING - F150 PICKUP .  

z

Install a new auxiliary transmission fluid cooler if there is leakage from the fluid cooler. Refer to 
AUXILIARY TRANSMISSION FLUID COOLER .  

2. If the fault is not visually evident, GO to SYMPTOM CHART .  

Symptom Chart 

CAUTION: When internal wear/damage occurs in the transmission, metal particles, 

clutch plate material, and band material can travel into the torque 
converter, the fluid cooler tubes, the intank transmission fluid cooler, and 
the auxiliary transmission fluid cooler, if so equipped. These contaminants 
are a major cause of recurring transmission concerns. To prevent future 
concerns, remove these contaminants from the cooling system before 
placing the transmission back into use. Refer to AUTOMATIC 
TRANSMISSION-4R100 - F150 PICKUP or AUTOMATIC TRANSMISSION-
4R70W - F150 PICKUP for fluid cooler flow testing, backflushing and 
cleaning, torque converter cleaning and inspection, and flushing. Refer to 
AUTOMATIC TRANSMISSION-4R100 - F150 PICKUP (4R100 only) for 
Cooler Bypass Valve (CBV) assembly (7H322) cleaning and flushing.

 

2003 Ford Pickup F150 

2003 TRANSMISSIONS Transmission Cooling - F150 Pickup

  

Fig. 7: Symptom Chart 
Courtesy of FORD MOTOR CO. 

REMOVAL & INSTALLATION 

AUXILIARY TRANSMISSION FLUID COOLER 

Special Tool(s) 

 

2003 Ford Pickup F150 

2003 TRANSMISSIONS Transmission Cooling - F150 Pickup