Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Rear Heater Unit

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See Figure 1

REMOVAL & INSTALLATION



Land Cruiser
  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Set the temperature control valve to COOL.
  6.  
  7. Remove the right front seat.
  8.  
  9. Disconnect the hoses running to the auxiliary heater. Have a pan and rags handy to contain drainage from the core and hoses.
  10.  
  11. Disconnect the wiring harness running to the unit.
  12.  
  13. Remove the retaining bolts holding the unit to the vehicle; remove the heater unit. Place the unit on the workbench.
  14.  
  15. Remove the clips and screws securing the case halves. Separate the case.
  16.  
  17. Remove the core from the case. The blower motor and fan may be removed if desired.
  18.  

To install:
  1. Place the core into the case, making certain the insulation and supports are in place. Install the blower fan if it was removed.
  2.  
  3. Assemble the case halves.
  4.  
  5. Install the unit into the vehicle. Make certain the inlet and outlet pipes are correctly placed in the grommets. Tighten the retaining screws.
  6.  
  7. Connect the wiring harness.
  8.  
  9. Install the hoses, using new clamps.
  10.  
  11. Install the right front seat.
  12.  
  13. Connect the negative battery cable.
  14.  
  15. Fill the cooling system.
  16.  
  17. Set the heater temperature control to HOT. Start and run the engine for 1 or 2 minutes, but no more.
  18.  
  19. Stop the engine. Inspect the coolant level in the radiator and top off the coolant as necessary.
  20.  
  21. Restart the engine and warm it fully; operate the auxiliary heater and check its function. Inspect the hose joints for leaks.
  22.  
  23. Check the coolant level in the overflow reservoir and top off as necessary. Do NOT remove the radiator cap on a hot engine.
  24.  

4Runner
  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Set the heater temperature control to COOL.
  6.  
  7. You will need to lift up the carpet on some models.
  8.  
  9. Remove the rear center console box. Be careful lifting it away from its mountings; disconnect the wiring harness from the rear controls as soon as access is gained.
  10.  
  11. Disconnect the hoses from the auxiliary heater unit.
  12.  
  13. Remove the rear heater ducts and control assembly.
  14.  
  15. Remove the retaining hardware securing the heater unit and remove the unit.
  16.  
  17. Separate the case halves and remove the heater core. Remove the blower fan and motor if desired.
  18.  

To install:
  1. Assemble the heater core and blower motor into the case.
  2.  
  3. Attach the case halves.
  4.  
  5. Install the heater unit and install the retaining hardware.
  6.  
  7. Attach the rear heater ducts and control assembly.
  8.  
  9. Use new clamps and connect the heater hoses.
  10.  
  11. Install the console, connecting the wiring harness before the console is in its final position.
  12.  
  13. Fill the cooling system.
  14.  
  15. Set the heater temperature control to HOT. Start and run the engine for 1 or 2 minutes, but no more.
  16.  
  17. Stop the engine. Inspect the coolant level in the radiator and top off the coolant as necessary.
  18.  
  19. Restart the engine and warm it fully; operate the auxiliary heater and check its function. Inspect the hose joints for leaks.
  20.  
  21. Check the coolant level in the overflow reservoir and top off as necessary. Do NOT remove the radiator cap on a hot engine.
  22.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the 4Runner rear heater assembly-1996 shown

 
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