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Pinpoint Test E: Temperature Control Is Inoperative

  1. E1 CHECK THE HEATER TEMPERATURE CABLE SYSTEM 
    • Allow the engine to reach a normal operating temperature.
    • Set the function selector switch to the MAX A/C position. Adjust the temperature control switch to full COOL (left) and check for cool air discharge.
    • Adjust the temperature control switch to full WARM (right) and check for warm air discharge.
    • Vary the temperature control switch from full WARM to full COOL.
    • Did the air temperature change? 
    • Yes  : The system is fully functional.
    • No  : GO to E2.
  2. E2 CHECK FOR A DISCONNECTED TEMPERATURE BLEND DOOR ACTUATOR CONTROL 
    • Inspect the temperature blend door actuator control cable installation on the heater core housing. Verify that it is in mid-position, fully seated on the shaft, and correctly located on the housing. Refer to CONTROL COMPONENTS .
      Fig 1: Checking For Disconnected Temperature Blend Door Actuator Control
      G03902229Courtesy of FORD MOTOR CO.
    • Is the temperature blend door actuator control cable fully seated on the shaft, in the mid-position, and correctly located on the housing? 
    • Yes  : GO to E3.
    • No  : CONNECT the temperature blend door actuator control cable correctly. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
  3. E3 CHECK THE TEMPERATURE BLEND DOOR ACTUATOR CONTROL CABLE OPERATION 
    • Rotate the temperature control switch from full WARM to full COOL while observing the heater temperature cable.
    • Is there corresponding movement from full warm to full cold between the temperature control switch and the heater temperature cable at the heater core housing? 
    • Yes  : INSTALL a new heater core housing due to a damaged air temperature blend door. REFER to HEATING AND VENTILATION . TEST the system for normal operation.
    • No  : GO to E4.
  4. E4 CHECK THE TEMPERATURE CONTROL OPERATION 
    • Inspect the temperature blend door actuator control cable installation on the temperature control switch.
      Fig 2: Checking Temperature Control Operation
      G03902230Courtesy of FORD MOTOR CO.
    • Is the temperature blend door actuator control cable connected? 
    • Yes  : GO to E5.
    • No  : CONNECT the temperature blend door actuator control cable. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
  5. E5 CHECK THE TEMPERATURE CONTROL SWITCH 
    • Rotate the temperature control switch from full WARM to full COOL while observing the heater temperature cable.
    • Is there corresponding movement from full warm to full cold between the temperature control switch and the heater temperature cable at the temperature control switch? 
    • Yes  : INSTALL a new heater temperature cable. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : INSTALL a new temperature control switch. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
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