Toyota Tercel 1984-1994 Repair Guide

Heater Unit

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CAUTION
On models equipped with a Supplemental Restraint System (SRS) or "air bag,'' work must NOT be started until at least 90 seconds have passed from the time that both the ignition switch is turned to the LOCK position and the negative cable is disconnected from the battery.

REMOVAL & INSTALLATION



See Figures 1 through 10

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system.
  4.  
  5. Remove the glove compartment and the lower trim panels.
  6.  
  7. Remove the cooling unit on air conditioned models. Refer to the appropriate procedure later in this section.
  8.  



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Fig. Fig. 1: Make sure you disconnect the hoses from the heater core before attempting to remove the heater unit

  1. In the engine compartment, disconnect the hoses from the heater core pipes. Also, remove the pipe grommets from the firewall.
  2.  
  3. Remove the control panel. Refer to the appropriate procedure.
  4.  
  5. Loosen the center duct attaching screws, then remove the duct.
  6.  



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Fig. Fig. 2: The instrument panel reinforcement brace is secured by several small bolts



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Fig. Fig. 3: Make sure you remove the brace; do not attempt to bend it out of the way

  1. Remove the instrument panel reinforcement braces.
  2.  



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Fig. Fig. 4: The heater unit extension is found on cars without air conditioning



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Fig. Fig. 5: The heater unit extension is secured by several screws

  1. Loosen the heater unit extension attaching screws, then remove the heater unit extension. This applies to vehicles without air conditioning only.
  2.  



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Fig. Fig. 6: Be sure to unplug the resistor block connector before attempting to remove the heater unit

  1. Label and disconnect any control cables attached to the heater unit.
  2.  
  3. Label and unplug any electrical connections on the heater unit.
  4.  



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Fig. Fig. 7: The heater unit has many hidden attaching screws



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Fig. Fig. 8: Removing the heater unit lower attaching bolt

  1. Loosen the heater unit attaching screws, then remove the unit from the vehicle. On some models, removing the left side duct may make removal easier. Be careful not to spill any coolant from the heater core inside the vehicle.
  2.  



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Fig. Fig. 9: On some models, removing the left side duct may make removal easier



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Fig. Fig. 10: Carefully lower the heater unit, be sure not to damage it and other components

To install:
  1. Install the heater unit to the vehicle. Engage any electrical and/or cable connections applicable. Also, install the left side duct if removed earlier.
  2.  
  3. Install the heater unit extension on cars without A/C.
  4.  
  5. Install the instrument panel reinforcement braces.
  6.  
  7. Install the center duct and the control panel.
  8.  
  9. Install the cooling unit on models equipped with A/C.
  10.  
  11. Install the lower trim panels and the glove compartment.
  12.  
  13. Install the grommets and hoses to the heater core pipes.
  14.  
  15. Fill the cooling system. Start the engine and check for leaks as well as proper heater operation.
  16.  

 
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