Lincoln Corsair: Transmission Cooling - Automatic Transmission – HF45 / Diagnosis and Testing - Transmission Cooling

• Transmission overheating

Normal Operation and Fault Conditions

• Plugged or damaged transmission fluid cooler or transmission fluid cooler tubes
  • Inspect the transmission fluid cooler and the transmission fluid cooler tubes for damage or plugging. INSTALL new components as necessary.REFER to: Transmission Fluid Cooler Tubes - Plug-In Hybrid Electric Vehicle (PHEV) (307-02B Transmission Cooling - Automatic Transmission – HF45, Removal and Installation).
    
• Active grille shutter stuck in closed position
  • Resolve any faults with the active grille shutter. REFER to: Active Grille Shutter (501-02 Front End Body Panels, Diagnosis and Testing).
    
• System leaks
  • Inspect transmission fluid cooler and transmission fluid cooler tubes for leaks. SERVICE as required.
• Internal transmission concerns
  • Inspect the transmission fluid pump and filter assembly. REFER to: Transmission - Plug-In Hybrid Electric Vehicle (PHEV) (307-01B Automatic Transmission - Automatic Transmission – HF45, Disassembly).
    
  • Inspect internal transmission components for indications of overheating. REFER to: Transmission - Plug-In Hybrid Electric Vehicle (PHEV) (307-01B Automatic Transmission - Automatic Transmission – HF45, Disassembly).
    REFER to: Transmission Case Cover (307-01B Automatic Transmission - Automatic Transmission – HF45, Removal and Installation).
    

Possible Sources

• Damaged transmission cooler or cooler tubes
• Inoperative active grille shutter
• Transmission fluid leak
• Internal transmission components