Toyota Corolla 1970-1987 Repair Guide

Heater Core

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See Figures 1 through 14

The heater core is simply a small heat exchanger (radiator) within the heater housing assembly in the vehicle. If the driver selects heat on the control panel, a water valve is opened allowing engine coolant to circulate through the heater core. The blower fan circulates air through the fins, picking up the heat from the engine coolant and then the heated air is ducted into the vehicle.

  1. Remove the heater unit assembly-refer to the necessary service procedure.
  2.  
  3. Remove the screws and 2 heater core retaining clip.
  4.  
  5. Remove the heater core from the heater unit.
  6.  
  7. Installation is the reverse of the removal procedure. Push the water hoses onto the heater core pipes as far as the ridge on the pipes. Refill the cooling system. Connect the negative battery cable. Check operation of heater and A/C system.
  8.  



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Fig. Fig. 1: Removing the heater unit assembly lower mounting bolt



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Fig. Fig. 2: Removing the dash assembly mounting screw



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Fig. Fig. 3: Removing the heater unit assembly lower mounting bolt



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Fig. Fig. 4: Removing the retaining screw for console assembly



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Fig. Fig. 5: Removing the heater duct from the the heater unit assembly



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Fig. Fig. 6: Removing the dash panel



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Fig. Fig. 7: View of the dash panel - most models similar



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Fig. Fig. 8: Removing the control cable from the control head assembly



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Fig. Fig. 9: View of the heater control cable clip



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Fig. Fig. 10: Removing the heater control assembly - most models similar



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Fig. Fig. 11: Removing the electrical connection from the control head assembly



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Fig. Fig. 12: Removing the lower mounting of heater unit



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Fig. Fig. 13: View of the heater core in the heater unit



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Fig. Fig. 14: Removing the heater core from the heater unit

 
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