GM Prizm/Nova 1985-1993 Repair Guide

Heater Control Unit Control Cables

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REMOVAL & INSTALLATION



Temperature Control Cable (To Heater Case)
1993

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the instrument panel from the vehicle.
  4.  
  5. Disconnect the temperature control cable from the heater control unit.
  6.  
  7. Disconnect the temperature control cable from the heater case and remove the cable from the vehicle.
  8.  

To install:
  1. Connect the temperature control cable to the heater case.
  2.  
  3. Connect the temperature control cable to the heater control unit.
  4.  
  5. Install the instrument panel to the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Heater control unit cable routing - 1993 models

Temperature Control Cable (To Engine Coolant Valve)
1993

See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the instrument panel from the vehicle.
  4.  
  5. Disconnect the temperature control cable from the heater control unit.
  6.  
  7. Disconnect the temperature control cable from the engine coolant control valve and remove the cable from the vehicle.
  8.  

To install:
  1. Connect the temperature control cable to the engine coolant control valve.
  2.  
  3. Connect the temperature control cable to the heater control unit.
  4.  
  5. Install the instrument panel to the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  



Click image to see an enlarged view

Fig. Fig. 2: Temperature control cable to engine coolant control valve - 1993 models

Fresh/Recirc Control Lever Cable
1993

See Figures 1 and 3

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the instrument panel from the vehicle.
  4.  
  5. Disconnect the fresh/recirc control lever cable from the heater control unit.
  6.  
  7. Disconnect the fresh/recirc control lever cable from the blower motor case and remove the cable from the vehicle.
  8.  

To install:
  1. Connect the fresh/recirc control lever cable to the blower motor case. Connect temperature control cable to the heater cable.
  2.  
  3. Connect the fresh/recirc control lever cable to the heater control unit.
  4.  
  5. Install the instrument panel to the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  



Click image to see an enlarged view

Fig. Fig. 3: Fresh/recirc control lever Cable to blower motor case

Mode Control Cable
1993

See Figures 1 and 4

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the instrument panel from the vehicle.
  4.  
  5. Disconnect the mode control lever cable from the heater control unit.
  6.  
  7. Disconnect the mode control lever cable from the heater control case.
  8.  

To install:
  1. Connect the mode control lever cable to the heater control case.
  2.  
  3. Connect the mode control lever cable to the heater control unit.
  4.  
  5. Install the instrument panel to the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  



Click image to see an enlarged view

Fig. Fig. 4: Mode control cable heater case

 
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